Include needed jquery dependency for rtd theme

* We ship this locally as python 3.6 installs an older sphinx, which doesn't
  seem to have this available.

docs/conf.py

@@ -58,7 +58,7 @@ sys.path.insert(0, os.path.abspath('sphinx_exts'))
 # Add any Sphinx extension module names here, as strings. They can be
 # extensions coming with Sphinx (named 'sphinx.ext.*') or your custom
 # ones.
-extensions = ['sphinx.ext.autodoc', 'sphinx_paramlinks']
+extensions = ['sphinx.ext.autodoc', 'sphinx_paramlinks', 'sphinxcontrib_jquery']
 
 # Add any paths that contain templates here, relative to this directory.
 templates_path = ['_templates']

docs/sphinx_exts/sphinxcontrib_jquery/__init__.py

@@ -0,0 +1,53 @@
+from os import makedirs, path
+import shutil
+
+import sphinx
+
+__version__ = "4.1"
+version_info = (4, 1)
+
+_ROOT_DIR = path.abspath(path.dirname(__file__))
+_FILES = (
+    (
+        'jquery.js',
+        'sha384-vtXRMe3mGCbOeY7l30aIg8H9p3GdeSe4IFlP6G8JMa7o7lXvnz3GFKzPxzJdPfGK',
+    ),
+    (
+        '_sphinx_javascript_frameworks_compat.js',
+        'sha384-lSZeSIVKp9myfKbDQ3GkN/KHjUc+mzg17VKDN4Y2kUeBSJioB9QSM639vM9fuY//',
+    ),
+)
+
+
+def add_js_files(app, config):
+    jquery_installed = getattr(app, "_sphinxcontrib_jquery_installed", False)
+
+    if sphinx.version_info[:2] >= (6, 0) and not jquery_installed:
+        makedirs(path.join(app.outdir, '_static'), exist_ok=True)
+        for (filename, integrity) in _FILES:
+            # The default is not to enable subresource integrity checks, as it
+            # does not trigger the hash check but instead blocks the request
+            # when viewing documentation locally through the ``file://`` URIs.
+            if config.jquery_use_sri:
+                app.add_js_file(filename, priority=100, integrity=integrity)
+            else:
+                app.add_js_file(filename, priority=100)
+            shutil.copyfile(
+                path.join(_ROOT_DIR, filename),
+                path.join(app.outdir, '_static', filename)
+            )
+        app._sphinxcontrib_jquery_installed = True
+
+
+def setup(app):
+    # Configuration value for enabling `subresource integrity`__ (SRI) checks
+    # __ https://developer.mozilla.org/en-US/docs/Web/Security/Subresource_Integrity
+    app.add_config_value("jquery_use_sri", default=False, rebuild="html", types=(bool,))
+
+    app.connect('config-inited', add_js_files)
+
+    return {
+        "parallel_read_safe": True,
+        "parallel_write_safe": True,
+        "version": __version__,
+    }

docs/sphinx_exts/sphinxcontrib_jquery/_sphinx_javascript_frameworks_compat.js

@@ -0,0 +1,123 @@
+/* Compatability shim for jQuery and underscores.js.
+ *
+ * Copyright Sphinx contributors
+ * Released under the two clause BSD licence
+ */
+
+/**
+ * small helper function to urldecode strings
+ *
+ * See https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/decodeURIComponent#Decoding_query_parameters_from_a_URL
+ */
+jQuery.urldecode = function(x) {
+    if (!x) {
+        return x
+    }
+    return decodeURIComponent(x.replace(/\+/g, ' '));
+};
+
+/**
+ * small helper function to urlencode strings
+ */
+jQuery.urlencode = encodeURIComponent;
+
+/**
+ * This function returns the parsed url parameters of the
+ * current request. Multiple values per key are supported,
+ * it will always return arrays of strings for the value parts.
+ */
+jQuery.getQueryParameters = function(s) {
+    if (typeof s === 'undefined')
+        s = document.location.search;
+    var parts = s.substr(s.indexOf('?') + 1).split('&');
+    var result = {};
+    for (var i = 0; i < parts.length; i++) {
+        var tmp = parts[i].split('=', 2);
+        var key = jQuery.urldecode(tmp[0]);
+        var value = jQuery.urldecode(tmp[1]);
+        if (key in result)
+            result[key].push(value);
+        else
+            result[key] = [value];
+    }
+    return result;
+};
+
+/**
+ * highlight a given string on a jquery object by wrapping it in
+ * span elements with the given class name.
+ */
+jQuery.fn.highlightText = function(text, className) {
+    function highlight(node, addItems) {
+        if (node.nodeType === 3) {
+            var val = node.nodeValue;
+            var pos = val.toLowerCase().indexOf(text);
+            if (pos >= 0 &&
+                !jQuery(node.parentNode).hasClass(className) &&
+                !jQuery(node.parentNode).hasClass("nohighlight")) {
+                var span;
+                var isInSVG = jQuery(node).closest("body, svg, foreignObject").is("svg");
+                if (isInSVG) {
+                    span = document.createElementNS("http://www.w3.org/2000/svg", "tspan");
+                } else {
+                    span = document.createElement("span");
+                    span.className = className;
+                }
+                span.appendChild(document.createTextNode(val.substr(pos, text.length)));
+                node.parentNode.insertBefore(span, node.parentNode.insertBefore(
+                    document.createTextNode(val.substr(pos + text.length)),
+                    node.nextSibling));
+                node.nodeValue = val.substr(0, pos);
+                if (isInSVG) {
+                    var rect = document.createElementNS("http://www.w3.org/2000/svg", "rect");
+                    var bbox = node.parentElement.getBBox();
+                    rect.x.baseVal.value = bbox.x;
+                    rect.y.baseVal.value = bbox.y;
+                    rect.width.baseVal.value = bbox.width;
+                    rect.height.baseVal.value = bbox.height;
+                    rect.setAttribute('class', className);
+                    addItems.push({
+                        "parent": node.parentNode,
+                        "target": rect});
+                }
+            }
+        }
+        else if (!jQuery(node).is("button, select, textarea")) {
+            jQuery.each(node.childNodes, function() {
+                highlight(this, addItems);
+            });
+        }
+    }
+    var addItems = [];
+    var result = this.each(function() {
+        highlight(this, addItems);
+    });
+    for (var i = 0; i < addItems.length; ++i) {
+        jQuery(addItems[i].parent).before(addItems[i].target);
+    }
+    return result;
+};
+
+/*
+ * backward compatibility for jQuery.browser
+ * This will be supported until firefox bug is fixed.
+ */
+if (!jQuery.browser) {
+    jQuery.uaMatch = function(ua) {
+        ua = ua.toLowerCase();
+
+        var match = /(chrome)[ \/]([\w.]+)/.exec(ua) ||
+            /(webkit)[ \/]([\w.]+)/.exec(ua) ||
+            /(opera)(?:.*version|)[ \/]([\w.]+)/.exec(ua) ||
+            /(msie) ([\w.]+)/.exec(ua) ||
+            ua.indexOf("compatible") < 0 && /(mozilla)(?:.*? rv:([\w.]+)|)/.exec(ua) ||
+            [];
+
+        return {
+            browser: match[ 1 ] || "",
+            version: match[ 2 ] || "0"
+        };
+    };
+    jQuery.browser = {};
+    jQuery.browser[jQuery.uaMatch(navigator.userAgent).browser] = true;
+}

docs/sphinx_exts/sphinxcontrib_jquery/jquery.js

@@ -0,0 +1,2 @@
+/*! jQuery v3.6.0 | (c) OpenJS Foundation and other contributors | jquery.org/license */
+!function(e,t){"use strict";"object"==typeof module&&"object"==typeof module.exports?module.exports=e.document?t(e,!0):function(e){if(!e.document)throw new Error("jQuery requires a window with a document");return t(e)}:t(e)}("undefined"!=typeof window?window:this,function(C,e){"use strict";var t=[],r=Object.getPrototypeOf,s=t.slice,g=t.flat?function(e){return t.flat.call(e)}:function(e){return t.concat.apply([],e)},u=t.push,i=t.indexOf,n={},o=n.toString,v=n.hasOwnProperty,a=v.toString,l=a.call(Object),y={},m=function(e){return"function"==typeof e&&"number"!=typeof e.nodeType&&"function"!=typeof e.item},x=function(e){return null!=e&&e===e.window},E=C.document,c={type:!0,src:!0,nonce:!0,noModule:!0};function b(e,t,n){var r,i,o=(n=n||E).createElement("script");if(o.text=e,t)for(r in c)(i=t[r]||t.getAttribute&&t.getAttribute(r))&&o.setAttribute(r,i);n.head.appendChild(o).parentNode.removeChild(o)}function w(e){return null==e?e+"":"object"==typeof e||"function"==typeof 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