Add a footer to documentation pages that encourages contributions

[PSalant726]

In an effort to streamline the maintenance of fidesctl documentation, each page should include a footer that encourages readers to open a PR that corrects mistakes and/or updates outdated information. Ideally the footer dynamically links to the markdown file currently being viewed, in the fides repository.

[iamkelllly]

Also adding to scope here to have a link to the Github repo

[brentonmallen1]

When attempting to serve the docs, I did a make clean but I'm still getting the FATAL: password authentication failed for user "postgres" error when attempting to build. I thought that was fixed but I could have missed something.

[ThomasLaPiana]

not sure how to help with that one, we made some changes but it was awhile ago, and the make clean should've fixed it 🤔 are you testing this PR?

[brentonmallen1]

I was attempting to do so by doing a make docs-serve but ran into the issue