docs(rtd): fix tutorials section

[wpbonelli]

I broke the tutorial RTD page when trying to add the new mfusg transport tutorials in #2617. Fix it. Correctly ignore the two new notebooks needing attention. And remove examples.rst and tutorials.rst, they're generated when docs are built.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 72.5%. Comparing base (556c088) to head (4a050d7).
⚠️ Report is 62 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #2621      +/-   ##
===========================================
+ Coverage     55.5%    72.5%   +17.0%     
===========================================
  Files          644      667      +23     
  Lines       124135   129018    +4883     
===========================================
+ Hits         68947    93623   +24676     
+ Misses       55188    35395   -19793     

see 556 files with indirect coverage changes

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