Docs: Run Tier 3 Repolinter on the repo & update all docs

[natalialuzuriaga]

Noticed that the docs are outdated, specifically the README missing certain sections.

1. Add Tier 3 workflows to .github directory
2. Run Tier 3 repolinter GH action
3. Update docs accordingly, ideally before Grace Hopper

Other cleanup:

• Add issue template to the repo
• Make sure it everything is community standards compliant: https://github.com/DSACMS/repo-scaffolder/community

[decause-gov]

10/25:

• will pick this up next week