Create a conref list

[jennyhuang17]

Conref = cross reference, for documentation, a conref list is mostly used for trademarks, product names, version numbers, etc. The purpose of having a conref list for documentation is for better maintaining terms that could change often but occur many times in the documentation.

We should have something similar to this for the whole documentation.

[jennyhuang17]

Some helpful resources:
https://stackoverflow.com/questions/37553750/how-can-i-link-reference-another-rest-file-in-the-documentation
https://stackoverflow.com/questions/15394347/adding-a-cross-reference-to-a-subheading-or-anchor-in-another-page