[Doc] Organizing Dev Doc

[roigcarlo]

📝 Description

• Full reorganization of For Devs,
• Some changes to linking in For Users
• Fixing the Index.md to display correctly in Jekyll
• Fixing duplicated ToC's from pages with existing ToC's from the wiki
• {:.no_toc} can now be used to exclude headers from the ToC
• Fixing doc generation by moving <h1> generated tags one level down.
• Removed legacy python 2.7 imports from future from code snippets
• Adding lang breadcrumb to codes I've detected
• Fixing detected broken links
• Moving autogenerated This-Is-Autogenerated.mdtag list to proper tag lists.

There may be a couple of undetected broken links, if you see them please tell me.
sorry for the large PR. Once this works small ones :D

🆕 Changelog

• organizing doc

[sunethwarna]

Thanks a lot @roigcarlo ... This is really cool :)