Add grid to the doc start page

[FedericoNegri]

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.82%. Comparing base (daf8ccb) to head (6863a8d).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #353   +/-   ##
=======================================
  Coverage   92.82%   92.82%           
=======================================
  Files          61       61           
  Lines        2258     2258           
=======================================
  Hits         2096     2096           
  Misses        162      162           

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[PipKat]

@FedericoNegri To follow our standard content structure, you need to move the card for the "API reference" section before the card for the "Examples" section. (I already made a suggested edit to the toc in the overall index.rst file to do this reordering.) Also, you need to add a card to the end for the "Contribute" section:
``.. grid-item-card:: Contribute :fa:people-group
:padding: 2 2 2 2
🔗 contributing
:link-type: doc

    Learn how to contribute to the PyHPS codebase
    or documentation.

[PipKat]

Some minor edits.

[FedericoNegri]

@FedericoNegri To follow our standard content structure, you need to move the card for the "API reference" section before the card for the "Examples" section. (I already made a suggested edit to the toc in the overall index.rst file to do this reordering.) Also, you need to add a card to the end for the "Contribute" section: ``.. grid-item-card:: Contribute :fa:people-group :padding: 2 2 2 2 🔗 contributing :link-type: doc

    Learn how to contribute to the PyHPS codebase
    or documentation.

done, thanks