Remove 6.2.0rc1 dir from gh-pages branch

[maxrjones]

Description of proposed changes

Note: To be merged into gh-pages brach

This PR removes the 6.2.0rc1 directory from the gh-pages branch because it is no longer published in the gmt documentation now that 6.2.0rc2 has been released.

Fixes #

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.

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[maxrjones]

I think we should have review protections for the gh-pages branch similar to the master branch. What are your thoughts @seisman and @PaulWessel?

[seisman]

I think it also means the bot can not deploy to the gh-pages branch.

[maxrjones]

I think it also means the bot can not deploy to the gh-pages branch.

Thanks for the explanation - I did not realize that. I will still ask for reviews for my PRs.