Added guide for navigation configuration

docs/extensions/permalinks.md

@@ -1,37 +0,0 @@
----
-template: overrides/main.html
----
-
-# Permalinks
-
-Permalinks are a feature of the [Table of Contents][1] extension, which is part
-of the standard Markdown library. The extension inserts an anchor at the end of
-each headline, which makes it possible to directly link to a specific section
-of the document.
-
-  [1]: https://python-markdown.github.io/extensions/toc/
-
-## Configuration
-
-Add the following lines to `mkdocs.yml`:
-
-``` yaml
-markdown_extensions:
-  - toc:
-      permalink: true
-```
-
-This will add a link containing the paragraph symbol `¶` at the end of each
-headline (exactly like on the page you're currently viewing), which Material
-for MkDocs will make appear on hover. In order to change the text of the
-permalink, a string can be passed, e.g.:
-
-``` yaml
-markdown_extensions:
-  - toc:
-      permalink: Link
-```
-
-## Usage
-
-When enabled, permalinks are inserted automatically.

docs/extensions/pymdown.md

@@ -57,7 +57,7 @@ extra_javascript:
 ```
 
 If you want to override the default MathJax configuration, you can do this by
-adding another JavaScript file **before** the MathJax runtime which contains
+adding another JavaScript file __before__ the MathJax runtime which contains
 the MathJax configuration, e.g.:
 
 ``` js
@@ -130,7 +130,7 @@ Lorem ipsum dolor sit amet: $p(x|y) = \frac{p(y|x)p(x)}{p(y)}$
 
 ### BetterEm
 
-[BetterEm][6] improves the handling of emphasis markup (**bold** and *italic*)
+[BetterEm][6] improves the handling of emphasis markup (__bold__ and _italic_)
 within Markdown by providing a more sophisticated parser for better detecting
 start and end tokens. Read the documentation for [usage notes][7].