Add a section to Highlight past winners for JDH plotting contest in docs

[Tahaabdul]

PR summary

• Added a link to past winners for the JDH plotting contest. Closes Highlight past winners for JDH plotting contest in docs #11129

• Changed placement of the python graph gallery from tutorials section to galleries

PR checklist

• "closes #0000" is in the body of the PR description to link the related issue
• new and changed code is tested
• Plotting related features are demonstrated in an example
• New Features and API Changes are noted with a directive and release note
• Documentation complies with general and docstring guidelines

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[pamelafox]

Can you bullet point this one as well? Also, this file uses RST syntax, not Markdown. You can learn about RST here: https://www.sphinx-doc.org/en/master/usage/restructuredtext/basics.html

[Tahaabdul]

Thanks for pointing that out, changed it.

[pamelafox]

@Tahaabdul You can see the staged docs here: https://output.circle-artifacts.com/output/job/f699e534-516d-4ca4-bb70-50ba920cfe39/artifacts/0/doc/build/html/users/resources/index.html
It looks like the author name for the first gallery is rendering on a separate line, can you get it to render on same line like others?

[rcomer]

Could you also change the title of this pull request to something more descriptive?

[pamelafox]

Alignment looks good! I'll let a matplotlib maintainer take it from here.

[jklymak]

Thanks @Tahaabdul (and @pamelafox for the review help!)

[jklymak]

BTW, I squashed the commits here as I assume you don't care about the history.