Update cookbook gallery with wavelet-cookbook per #216

[pythia-pr-machine]

Update cookbook gallery as requested in #216. Closes #216.

[github-actions]

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[erogluorhan]

@brian-rose @mgrover1 @cyschneck

I've given this cookbook a review and really enjoyed the content; however, I need to note one thing:

The basics of wavelets and most of the example workflows are covered through audio data rather than geosciences. The only application to the Earth system sciences showcased in it is the last part.

Since I wasn't there at the Cookoff 2024, I might be missing some context about this, which you all may have already discussed.

What do you think?

[cyschneck]

The first two sections are more introductory, I was going to continue to add more workflows to use geoscience data, but wanted to meet the AMS deadline for the cookbook. I have some WIP for ocean work (I was looking at this sea surface heights data from NOAA) and some data from NSIDC (like sea ice).

Would it make more sense if I moved the first two workflows into the Foundations section? This would keep the geoscience workflows in the main section

[erogluorhan]

I think covering even the Foundations through some kind of geoscience data might be more favorable for Pythia's training purposes but I don't think we have ever documented any constraints as such, so I am curious about others' thoughts.