Link to GitHub repo from docs and vice versa

There is no link to the docs on the front page of the repo (README or Description) that I could find.

There is also no link back to the repository in the docs. This is a major problem as axiom is a *very* well used term, and a simple google search did not return this repo in the top hits.

Would also be good for the Description to have a short description of the purpose of the repository.

Start with the repository README and GitHub Description, then locate the documentation entry point mentioned in the issue. Add reciprocal links between the repository and docs, and give the repository Description a short purpose statement; done means users can navigate in both directions and identify the project from its listing.

Written by the indexing model from the issue text.