Update donation link

[zackkrida]

Fixes

Related to /~https://github.com/creativecommons/tech-support/issues/716 by @annatuma

Description

Renames all donation links to https://creativecommons.org/donate

Technical details

Tests

Screenshots

Checklist

• My pull request has a descriptive title (not a vague title like Update index.md).
• My pull request targets the default branch of the repository (main or master).
• My commit messages follow best practices.
• My code follows the established code style of the repository.
• I added tests for the changes I made (if applicable).
• I added or updated documentation (if applicable).
• I tried running the project locally and verified that there are no
  visible errors.

Developer Certificate of Origin

Developer Certificate of Origin

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    indicated in the file; or

(b) The contribution is based upon previous work that, to the best
    of my knowledge, is covered under an appropriate open source
    license and I have the right under that license to submit that
    work with modifications, whether created in whole or in part
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    in the file; or

(c) The contribution was provided directly to me by some other
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/~https://github.com/creativecommons/creativecommons-base/pull/53