Rename tool everywhere

[mpatrou]

Short description of the changes:

The name is updated to hyspecppt in every src, test, doc and build-related files.
Other improvements are added, too.

Long description of the changes:

• It updates hyspecppt in files, classes, logging, imports, tests, documentation, code coverage, default urls, build-related files and github actions.
• additional test for invalid command argument
• documentation update with newer requirement changes
• readthedocs update and project import

Check list for the pull request

• I have read the [CONTRIBUTING]
• I have read the [CODE_OF_CONDUCT]
• I have added tests for my changes
• I have updated the documentation accordingly

Check list for the reviewer

• I have read the [CONTRIBUTING]
• I have verified the proposed changes
• best software practices
  • all internal functions have an underbar, as is python standard
  • clearly named variables (better to be verbose in variable names)
  • code comments explaining the intent of code blocks
• All the tests are passing
• The documentation is up to date
• code comments added when explaining intent

Manual test for the reviewer

References

[Story] Rename Hyspec Polarization Planning Tool

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 95.00000% with 1 line in your changes missing coverage. Please review.

Project coverage is 90.50%. Comparing base (decafcc) to head (18fb5d2).

Files with missing lines	Patch %	Lines
src/hyspecppt/hyspecppt.py	88.88%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             next       #7   +/-   ##
=======================================
  Coverage   90.50%   90.50%           
=======================================
  Files           8        8           
  Lines         158      158           
=======================================
  Hits          143      143           
  Misses         15       15           

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[KyleQianliMa]

All looks good! Approved