Add tutorial for geodetic_to_geocentric transformation

[LL-Geo]

Add tutorials for Converting geodetic latitude and height into geocentric latitude and radius

I feel it's better to tell the coordinate and the ellipsoid height first, then go to the gravity disturbance

Reminders:

• [x] Run make format and make check to make sure the code follows the style guide.
• [ ] Add tests for new features or tests that would have caught the bug that you're fixing.
• [ ] Add new public functions/methods/classes to doc/api/index.rst and the base __init__.py file for the package.
• [ ] Write detailed docstrings for all functions/classes/methods. It often helps to design better code if you write the docstrings first.
• [ ] If adding new functionality, add an example to the docstring, gallery, and/or tutorials.
• [ ] Add your full name, affiliation, and ORCID (optional) to the AUTHORS.md file (if you haven't already) in case you'd like to be listed as an author on the Zenodo archive of the next release.

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[leouieda]

@LL-Geo thanks for this! I'll try have a look at it as soon as possible.

[leouieda]

I like the figure! Did you make it youself?

[LL-Geo]

I like the figure! Did you make it youself?

Haha. Yepp. Find a new hobby for making figures :laughing:

[LL-Geo]

@LL-Geo great stuff! Left a few suggestions to make sure the website builds correctly. The tutorial itself is really good 💯

You can commit the suggestions directly through GitHub (there should be a "Commit suggestion" button next to each). Once you're done, please give me a ping and I'm happy to merge this ❤️

Please also add yourself to the AUTHORS.md file if you'd like. Either in this PR or in a new PR later would be fine. Whatever works best for you.

All done! Haha. Thanks for all the comments and suggestions! :wink:

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[leouieda]

🎉 Congrats on the first PR, @LL-Geo! Hopefully the first of many 🙂