docs(mkdocs.yml): better layout with seperate TOC and updated code references

[tumaysem]

All code references updated according to v2. Better document site layout with separate TOC.

[coveralls]

Pull Request Test Coverage Report for Build 4383989594

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 71.264%

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Totals
Change from base Build 4359201558:	0.0%
Covered Lines:	248
Relevant Lines:	348

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💛 - Coveralls

[aasseman]

PS: I built and pushed from my laptop, no problems there. The newest docs are now live :)