Add a gallery component

[avik-pal]

• New tutorial cards. Fixes #567
• Section on aggregated tutorials from different sources

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 87.51%. Comparing base (132b99a) to head (edf2f13).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #579 +/- ## ======================================= Coverage 87.51% 87.51% ======================================= Files 37 37 Lines 1971 1971 ======================================= Hits 1725 1725 Misses 246 246 ```

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