Add repository link to Lightning Creek data

[MGomezN]

Add a pre-processing link for lightning-creek-magnetic.py

Relevant issues/PRs:

First step towards #39

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[leouieda]

Hey @MGomezN just checking in here 👋🏾. Let know when you're ready or need any help with this.

[leouieda]

@MGomezN could you please also add that to the function docstring here: https://github.com/fatiando/ensaio/blob/main/ensaio/_fetchers.py#L605

[leouieda]

@MGomezN made a small change to the link text to make it more generic so we can copy the same thing into the other datasets as well. I also fixed the formatting in the gallery which much be rst instead of md.

[leouieda]

@MGomezN for reference, this check was failing after I merged in the suggestions I made through github: https://github.com/fatiando/ensaio/actions/runs/3298037710/jobs/5439631739#step:6:9

Run make flake8
flake8 ensaio doc tools
doc/gallery_src/lightning-creek-magnetic.py:21:29: W291 trailing whitespace

flake8 is a tool we use to check the style of the code for common mistakes and consistency. One of those checks is making sure lines of code or documentation don't have a trailing white space at the end. When I code on my computer, I setup my editor to automatically remove these when I save a file. But on GitHub, it didn't do that so the check caught it. To fix this, I went into line 21 of the that file and deleted the whitespace at the end of the line. See this commit: 16077a4

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[leouieda]

Merged! 🎉 Please add yourself to the AUTHORS.md file. Thanks for the help with this @MGomezN! Hope it was a useful learning experience.

[MGomezN]

Oh, Leo! It was a helpful learning experience for me, but for you, OMG, it was more like a nightmare-Halloween experience, didn't it? It takes 10x times as to fix my mistakes than do it yourself. But you are a committed teacher, and I appreciate that. I will do it better next time!

[leouieda]

Not at all 🙂 Sure, I could have done it faster but I also have little time to spare and won't be around forever. So it's a selfish investment to teach you so I don't have to do things in the future 😬 My goal is to eventually sit back at the beach and watch Fatiando run itself 🍹

[MGomezN]

My goal is to eventually sit back at the beach and watch Fatiando run itself

Mmm that's exactly what I'm doing right now :)