Add a GMT team page and update contributor recognition model

[maxrjones]

Description of proposed changes

This PR makes four changes to the GMT documentation:

1. Add a GMT Team page that contains a Distinguished Contributors section which can be used to recognize people's efforts. This is largely based on the project Jupyter distinguished contributors model and the NumPy team page. Suggestions are welcome for the recognition model, in which new distinguished contributors are decided upon by the people listed on the page annually.
2. Change AUTHORS.md to THANKS.md to better reflect the updated contents.
3. Move pages that are in the Developer Resources toctree to the devdocs folder and updates links accordingly.
4. Rename Developer Documentation page to GMT Enhancement Proposals to provide more descriptive information about the contents.

If this is approved, we should change the redirect for https://www.generic-mapping-tools.org/team from https://github.com/GenericMappingTools/gmt/blob/master/AUTHORS.md.

Fixes #2330
Fixes #5567

Reminders

• Make sure that your code follows our style. Use the other functions/files as a basis.
• Add tests for new features or tests that would have caught the bug that you're fixing.
• Describe changes to function behavior and arguments in a comment below the function declaration.
• If adding new functionality, add a detailed description to the documentation and/or an example.

[maxrjones]

Preview page: https://gmt-gvgpxvnd5-gmt.vercel.app/devdocs/team.html

[seisman]

For the "Distinguished Contributors" (or Team Members in AUTHORS.md), is it better to sort people by the time they joined the team? I'm a little overwhelmed as I'm currently listed as the first one.

[maxrjones]

For the "Distinguished Contributors" (or Team Members in AUTHORS.md), is it better to sort people by the time they joined the team? I'm a little overwhelmed as I'm currently listed as the first one.

I can change this to sorted by time 😄 I just went by alphabetical out of habit.

[maxrjones]

For the "Distinguished Contributors" (or Team Members in AUTHORS.md), is it better to sort people by the time they joined the team? I'm a little overwhelmed as I'm currently listed as the first one.

Done now, thanks for the recommendation.

[PaulWessel]

I guess this may make me update the GitHug pix...

[maxrjones]

@seisman, do you know how I could set the redirect link for https://www.generic-mapping-tools.org/team.html to go to the new page after merging?

[seisman]

You need to change the URL in this file:
https://github.com/GenericMappingTools/website/blob/master/team.html

[maxrjones]

You need to change the URL in this file:
https://github.com/GenericMappingTools/website/blob/master/team.html

Thanks!