Add a table of contents page on every documentation.

# Feature request
I am suggesting a table of contents on each documentation.

## Summary

The table of contents should start with entry into the language or framework, then functional or class reference of it.

This will make sure that everyone getting started on a language has a clear flow of knowledge from easy to expert, then for the experts, functional reference list will be a plus

## Examples
lets say we want to create a table of contents for html:

Table of Contents: HTML
What is html ........................................................ 1
Evolution of HTML ............................................ 2
some feature ....................................................... n

Functional References
function one ......................................................... n +2