A gallery example for the contour method

[yohaimagen]

Description of proposed changes

In response to issue #1340 adding a gallery example for the contour method.

Fixes #1340

Preview at https://pygmt-git-fork-yohaimagen-contour-gallery-example-gmt.vercel.app/gallery/images/contours.html

Reminders

• 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.
• Write detailed docstrings for all functions/methods.
• If adding new functionality, add an example to docstrings or tutorials.

Slash Commands

You can write slash commands (/command) in the first line of a comment to perform
specific operations. Supported slash commands are:

• /format: automatically format and lint the code
• /test-gmt-dev: run full tests on the latest GMT development version

[welcome]

💖 Thanks for opening this pull request! 💖

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[maxrjones]

/format

[maxrjones]

Great work @yohaimagen; thanks for addressing this issue! I have made a few suggestions on this pull request. If you agree with the suggestions, you can commit the changes using these steps:

1. Click on the 'Files changed' tab in the pull request
   
2. For each comment, you can click 'commit suggestion' in order to commit the suggestions one at a time or click 'add suggestion to batch', which allows you to commit multiple suggestions at once. If you plan to accept multiple suggestions, I recommend using the 'add suggestion to batch' option.
   
   2a. If you clicked 'commit suggestion', you'll see a pop-up where you can enter a descriptive commit message and then click 'commit changes'.
   2b. If you clicked 'add suggestion to batch', after reviewing all the suggestions, you can click 'commit suggestions' near the top of the 'files changed' tab. This will similarly prefill a commit message and allow you to commit the changes.

Feel free to reach out if you have any questions!

[yohaimagen]

Sorry, I didn't saw your suggestions before adding some of my own, I incorporate some of your suggestions into mine.

[maxrjones]

/format

[maxrjones]

No worries, your revisions are great! I have made a set of small comments, mostly related to sphinx formatting, which can be really particular. I also recommended to increase the contour spacing from 5 to 10 in order to make it easier to see the difference between the contour spacing and the annotation spacing.

[yohaimagen]

Great, I committed all of your suggestions @meghanrjones. I think that this gallery example is done :)

[yohaimagen]

One last thing, maybe it will be better to put this example under "Images, contours, and fields" than under "Lines and vectors".

[maxrjones]

Great work!

We usually leave approved pull requests open for ~1 day or until we get a second approval before merging, just in case other maintainers see anything major that needs adjusting.

[welcome]

🎉🎉🎉 Congrats on merging your first pull request and welcome to the team! 🎉🎉🎉

Please open a new pull request to add yourself to the AUTHORS.md file. We hope that this was a good experience for you. Let us know if there is any way that the contributing process could be improved.

[maxrjones]

Great work @yohaimagen, congratulations on merging the PR! 🎉 We hope to see you around more 😄

[weiji14]

Cheers @yohaimagen! Your gallery example is now live at https://www.pygmt.org/dev/gallery/index.html#images-contours-and-fields. Well done! 🥳