Restructure docs

Signed-off-by: Julius Härtl <[email protected]>

docs/Markdown.md

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+## What is Markdown
+
+The [wikipedia markdown entry](https://en.wikipedia.org/wiki/Markdown) introduced markdown as : 
+
+> Markdown is a lightweight markup language with plain text formatting syntax. It is designed so that it can be converted to HTML and many other formats using a tool by the same name. Markdown is often used to format readme files, for writing messages in online discussion forums, and to create rich text using a plain text editor. As the initial description of Markdown contained ambiguities and unanswered questions, many implementations and extensions of Markdown appeared over the years to answer these issues.
+
+## Markdown in Deck
+The Deck application plugin uses the [markdown-it](https://github.com/markdown-it/markdown-it) script to offer support for markdown in the cards description field.
+
+## Supported Markdown
+
+Markdown comes in may flavors. The best way to learn markdown and understand how to use it, is simply to [try it](https://markdown-it.github.io) on the original script official playground.
+That same link offers also a comprehensive list of what is supported, and what is not - rendering it unnecessary to duplicate that content in here.  
+
+[CommonMark Markdown Reference](http://commonmark.org/help/)
+
+## Known Issues
+
+As per [issue #127](https://github.com/nextcloud/deck/issues/127) Due to a known limitation of the current script to support markdown, Links that contain the `")"` character will not display well, or will break. 
+The recommended solution is to use `"<"` and `">"` to wrap those links. It should assure their integrity.
+If you come by another case of broken link, or broken display of links, please report it by opening a new issue.
+
+
+
+
+
+

docs/extra.css

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+.subnav ul {
+    padding-left: 20px;
+}

docs/index.md

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+../README.md

mkdocs.yml

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 site_name: Nextcloud Deck
-theme: readthedocs
-markdown_extensions:
-    - toc:
-        permalink: True
+theme:
+    name: readthedocs
+extra_css: [extra.css]
+nav:
+    - Home: index.md
+    - User documentation:
+        - Markdown composing: Markdown.md
+    - API documentation:
+        - REST API: API.md
+        - Nextcloud API: API-Nextcloud.md
+