Fix backmerge workflow and polish docs & tutorial output

[AndrewSazonov]

This PR includes a small set of related maintenance and polish improvements:

CI / GitHub Actions

• Fixes and simplifies the backmerge workflow, ensuring correct creation and auto-merging of backmerge PRs from master into develop after a release tag.

Documentation & Output Polishing

• Improves console section header formatting for clearer and more consistent CLI output.
• Removes an unnecessary trailing newline in the Jupyter Notebook bootstrap snippet, avoiding creation of an extra cell (e.g. in Google Colab).

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 83.15%. Comparing base (4b8c008) to head (abc62e3).
⚠️ Report is 5 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #115   +/-   ##
=======================================
  Coverage   83.15%   83.15%           
=======================================
  Files          89       89           
  Lines        5455     5455           
  Branches      452      452           
=======================================
  Hits         4536     4536           
  Misses        753      753           
  Partials      166      166           

Flag	Coverage Δ
integration	69.93% <0.00%> (ø)
unittests	73.34% <100.00%> (ø)

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