docs: cards layout for the landing page

[Revathyvenugopal162]

Description

change the cards layout for the landing page

Issue linked

_

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)

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 85.14%. Comparing base (1b82d34) to head (bdfa397).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3414      +/-   ##
==========================================
+ Coverage   85.13%   85.14%   +0.01%     
==========================================
  Files          55       55              
  Lines        9925     9925              
==========================================
+ Hits         8450     8451       +1     
+ Misses       1475     1474       -1     

[germa89]

Thank you a lot for this @Revathyvenugopal162 . It looks great!