#549 Add MessageMapping docs

[abpolym]

Should resolve #549 . I also added LiveServer as a dependency to docs/Project.toml.

The docs now should show this:

Let me know if the docs bla bla that I added is actually correct haha

[github-actions]

🤖 Code Formatting

Your PR still has some code formatting issues. I've updated PR #551 with the necessary formatting changes.

You can merge that PR into this branch to fix the code style check.

Alternatively, you can run make format locally and push the changes yourself.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 79.49%. Comparing base (d2fd139) to head (3b5de69).
⚠️ Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #550      +/-   ##
==========================================
- Coverage   80.24%   79.49%   -0.76%     
==========================================
  Files         211      211              
  Lines        6190     6163      -27     
==========================================
- Hits         4967     4899      -68     
- Misses       1223     1264      +41     

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[bvdmitri]

lgtm :)

[bvdmitri]

Tests for 1.10 are failing is unrelated so I'll merge