Add project: mkdocs-marimo

[fkromer]

What kind of change does this PR introduce?

• Add a project
• Update a project
• Remove a project
• Add or update a category
• Change configuration
• Documentation
• Other, please describe:

Description:

Checklist:

• I have read the CONTRIBUTING guidelines.
• I have not modified the README.md file. Projects are only supposed to be added or updated within the projects.yaml file since the README.md file is automatically generated.

[pawamoy]

Thanks!

Just the plugin entry to fix:

mkdocs-marimo:
     Missing entry point [mkdocs.plugins] 'mkdocs-marimo'.
     Instead got {'mkdocs.plugins': ['marimo']}

[pawamoy]

Awesome, thanks!

[fkromer]

The credits goes to the marimo team 😉