Add DeepWiki badge

[utensil]

This will:

1. allow users to have access to AI generated wiki that evolves with and benefits from both doc and code.
2. enable auto refresh the wiki weekly with the latest code

For 2, see:

It's a way to observe how current doc and code can provide information on different aspects of GAlgebra. If AI could not pick it up using DeepResearch, how could we expect users to learn it in the haystack of doc, notebooks, tests, and code?

This is also a reaction to the fact that GAlgebra contains docs from different times and by different authors, and may not be coherent. I don't have time to sort all out, but it's at least useful to observe to what extent AI could be confused (or not, hopefully).

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 78.93%. Comparing base (574c6c3) to head (ac87713).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #539   +/-   ##
=======================================
  Coverage   78.93%   78.93%           
=======================================
  Files          19       19           
  Lines        4452     4452           
=======================================
  Hits         3514     3514           
  Misses        938      938           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.