docs: adding cheat sheet on documentation

[clatapie]

Description

Adding quarto cheat sheet to the PyMAPDL documentation

Checklist

• I have visited and read Develop PyMAPDL.
• I have tested my changes locally
• I have added necessary documentation or updated existing documentation.
• I have followed the PyMAPDL coding style guidelines.
• I have added appropriate unit tests that also ensure the minimal coverage criteria.
• I have reviewed my changes before submitting this pull request.
• I have linked the issue or issues that are solved to the PR if any.
• I have assigned this PR to myself.
• I have marked this PR as draft if it is not ready to be reviewed yet.
• I have made sure that the title of my PR follows Commit naming conventions (e.g. feat: adding new MAPDL command)

[ansys-reviewer-bot]

Thanks for opening a Pull Request. If you want to perform a review write a comment saying:

@ansys-reviewer-bot review

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 83.37%. Comparing base (8298793) to head (6be7bcc).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3422      +/-   ##
==========================================
- Coverage   85.14%   83.37%   -1.77%     
==========================================
  Files          55       55              
  Lines        9962     9962              
==========================================
- Hits         8482     8306     -176     
- Misses       1480     1656     +176     

[clatapie]

The following error appears when building the documentation locally:

Extension error (ansys_sphinx_theme):
Handler <function build_quarto_cheatsheet at 0x0000021EF1FB3F60> for event 'builder-inited' threw an exception (exception: Failed to convert PDF to PNG: Unable to get 
page count.
I/O Error: Couldn't open file 'D:/repos/pyansys/pymapdl_3/doc/_build/html/_static/cheat_sheet.pdf': No error.
, ensure `poppler` is installed. See https://pypi.org/project/pdf2image/)

poppler is correctly installed and has been added to PATH.

[Revathyvenugopal162]

The following error appears when building the documentation locally:

Extension error (ansys_sphinx_theme):
Handler <function build_quarto_cheatsheet at 0x0000021EF1FB3F60> for event 'builder-inited' threw an exception (exception: Failed to convert PDF to PNG: Unable to get 
page count.
I/O Error: Couldn't open file 'D:/repos/pyansys/pymapdl_3/doc/_build/html/_static/cheat_sheet.pdf': No error.
, ensure `poppler` is installed. See https://pypi.org/project/pdf2image/)

poppler is correctly installed and has been added to PATH.

i will look at this

[clatapie]

Thanks a lot @Revathyvenugopal162!