docs: clarifying MAPDL commands API section

[germa89]

• Now there is no left side bar. It is not needed, and it was too much info. Ideally we would like to have a custom sidebar there: https://jugmac00.github.io/til/how-to-add-a-menu-to-the-sidebar-with-sphinx/
• Update pyansys logo to use transparencies (more compatible with new color set)

[ansys-reviewer-bot]

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[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 84.16%. Comparing base (f6224a5) to head (6c66c2b).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3071      +/-   ##
==========================================
- Coverage   86.64%   84.16%   -2.49%     
==========================================
  Files          52       52              
  Lines        9553     9553              
==========================================
- Hits         8277     8040     -237     
- Misses       1276     1513     +237     

[germa89]

@Revathyvenugopal162 you might want to add the pyansys logos with transparencies to the ansys-sphinx-theme package.

[germa89]

@pyansys-ci-bot LGTM.

[pyansys-ci-bot]

✅ Approving this PR because germa89 said so in here 😬