Use "Common Changelog" format for Changelog

[danielfromearth]

Use Common Changelog.

For instance, this change recategorizes entries into "Common Changelog" groups, formats headings, and uses an imperative mood.

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📚 Documentation preview 📚: https://earthaccess--584.org.readthedocs.build/en/584/

[danielfromearth]

@jhkennedy, @mfisher87 — following up from a mention of this yesterday — any suggestions for linting of markdown in a CI pipeline?

[mfisher87]

I'm OK with bringing prettier back for formatting markdown (no strong feelings on whether we go back to using it for YAML. The new formatter we're using for YAML is more configurable). We may want to find a different mirror than the archived official pre-commit one. Several folks have already forked it (e.g. https://github.com/rbubley/mirrors-prettier) to remove the alpha/beta versions that were causing us problems.

I do feel it's important to use a formatter for accessibility. It would be nice to also add a linter, if it's compatible with our formatter, to catch only-human-fixable things like broken links, but maybe we could treat that as a separate issue.

[jhkennedy]

When we had looked into markdown linting before, we settled on this one as being the best option:
https://github.com/DavidAnson/markdownlint