Setup HTML redirects for links used in the website

[eliasdorneles]

Expected Behavior

Links previously used in the website should redirect to some version of the content.

Current Behavior

These links are currently returning a 404:

http://batavia.readthedocs.io/en/latest/community/contributing.html
http://batavia.readthedocs.io/en/latest/intro/index.html

Proposal solution

We can do HTML redirects as suggested here: https://tech.signavio.com/2017/managing-sphinx-redirects

In the future, that functionality could be wrapped in a Sphinx extension.

[utkarsh-raj]

Is the issue open? @eliasdorneles