Auto generation of menu images in Wiki

[zhovner]

I would like to automatically add menu tree images to every wiki page where the menu structure is described.

For example this page NFC.md has such entry:

<!--- Menu structure -->

Menu tree markdown code...

<!--- Menu structure end -->

---

CI bot may work somewhere around this way:

1. Look for <!--- Menu structure --> entries in every .md file

2. Generate PNG and name it with [filename].md + [H1 header] above the entry + [tree] + [.png]

   For example, if we have a text file named NFC.md and get code like this inside:

   # Reader mode
   
   <!--- Menu structure -->
   
   Menu tree markdown code... 
   
   <!--- Menu structure end -->
   

   we will get filename: nfc-reader-mode-tree.png

3. Put file inwiki_static folder using this logic:

   • Replace text file path /wiki/applications/NFC.md --> /wiki_static/applications/NFC/
   • Put image in this folder.
   • Create folder if not exists.

4. Insert image above the each <!--- Menu structure --> entry in markdown format with absolute path: ![](https://github.com/Flipper-Zero/flipperzero-firmware-community/raw/master/wiki_static/applications/NFC/nfc-reader-mode-tree.png)