🚇🗑️ Remove binder link and integrations

[s-weigand]

This PR removes the binder and the integration to add a PR comment with a binder link, as well as the workflow that triggers a build on binder when a commit is pushed to main.
The reason to remove binder is that it hasn't been working properly for many months (i.e. timeout when opening) and checking the link in the docs recently also started failing.

Change summary

• 🚇🗑️ Remove binder link and integrations

Checklist

• ✔️ Passing the tests (mandatory for all PR's)

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[github-actions]

👈 Launch a binder notebook on branch s-weigand/pyglotaran-extras/remove-binder

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 58.26%. Comparing base (ba5d46d) to head (dffa9b6).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #300   +/-   ##
=======================================
  Coverage   58.26%   58.26%           
=======================================
  Files          31       31           
  Lines        1598     1598           
  Branches      290      290           
=======================================
  Hits          931      931           
  Misses        651      651           
  Partials       16       16           

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