Include dashboard.css in GUI assets

Add /css/dashboard.css to the GUI asset lists so dashboard styles are served and bundled. Updated src/gui/puter-gui.json and src/gui/src/static-assets.js to include the new stylesheet.

src/gui/puter-gui.json

@@ -21,7 +21,8 @@
             "/css/normalize.css",
             "/lib/jquery-ui-1.13.2/jquery-ui.min.css",
             "/css/style.css",
-            "/css/theme.css"
+            "/css/theme.css",
+            "/css/dashboard.css"
         ],
         "js_paths": [
             "/src/init_sync.js",

src/gui/src/static-assets.js

@@ -40,6 +40,7 @@ const css_paths = [
     '/css/normalize.css',
     '/lib/jquery-ui-1.13.2/jquery-ui.min.css',
     '/css/style.css',
+    '/css/dashboard.css',
 ];
 
 // Ordered list of JS scripts