chore: add spacing in markdown example

This also makes the markup for lists compliant with Python-Markdown (required blank line before).

Signed-off-by: Timothée Mazzucotelli <dev@pawamoy.fr>

python/zensical/bootstrap/docs/markdown.md

@@ -5,6 +5,7 @@ icon: simple/markdown
 # Markdown in 5min
 
 ## Headers
+
 ```
 # H1 Header
 ## H2 Header
@@ -15,6 +16,7 @@ icon: simple/markdown
 ```
 
 ## Text formatting
+
 ```
 **bold text**
 *italic text*
@@ -24,6 +26,7 @@ icon: simple/markdown
 ```
 
 ## Links and images
+
 ```
 [Link text](https://example.com)
 [Link with title](https://example.com "Hover title")
@@ -32,19 +35,23 @@ icon: simple/markdown
 ```
 
 ## Lists
+
 ```
 Unordered:
+
 - Item 1
 - Item 2
   - Nested item
 
 Ordered:
+
 1. First item
 2. Second item
 3. Third item
 ```
 
 ## Blockquotes
+
 ```
 > This is a blockquote
 > Multiple lines
@@ -52,6 +59,7 @@ Ordered:
 ```
 
 ## Code blocks
+
 ````
 ```javascript
 function hello() {
@@ -61,6 +69,7 @@ function hello() {
 ````
 
 ## Tables
+
 ```
 | Header 1 | Header 2 | Header 3 |
 |----------|----------|----------|
@@ -69,6 +78,7 @@ function hello() {
 ```
 
 ## Horizontal rule
+
 ```
 ---
 or
@@ -78,6 +88,7 @@ ___
 ```
 
 ## Task lists
+
 ```
 - [x] Completed task
 - [ ] Incomplete task
@@ -85,11 +96,13 @@ ___
 ```
 
 ## Escaping characters
+
 ```
 Use backslash to escape: \* \_ \# \`
 ```
 
 ## Line breaks
+
 ```
 End a line with two spaces  
 to create a line break.