v0.3.2 Add v0.3 branch and reduce need to update on Actions updates

[danielfdickinson]

Reduces manual updates

• Add a v0.3 branch for those who want to depend on latest stable
• Reduce our need to update this repo to get our own Actions updates
• Should reduce release/tag thrashing/noise.

What's changed

• Update action versions and add markdownlint by @danielfdickinson in Update action versions and add markdownlint #14
• Reduce updating for every tag or update by @danielfdickinson in Reduce updating for every tag or update #16

Full Changelog: v0.3.1...v0.3.2

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This discussion was created from the release v0.3.2 Add v0.3 branch and reduce need to update on Actions updates.