Readiness for publishing and releasing this action

### Blockers for 1st release
- [x] Update repository docs
- [x] Document workflow examples
- [x] Analyze feature gaps compared to arm-deploy
- [x] Convert repo to public
- [X] https://github.com/Azure/deploy/issues/25
- [X] https://github.com/Azure/deploy/issues/27
- [x] Stacks team review
- [x] Complete Azure OSS review
- [x] Complete OSS release checklist: https://docs.opensource.microsoft.com/releasing/#release-checklist
- [ ] https://github.com/Azure/deploy/issues/35
- [x] Add README banner to arm-deploy

### Post 1st release
- [ ] https://github.com/Azure/deploy/issues/26
- [ ] https://github.com/Azure/deploy/issues/34
- [ ] Create Microsoft Learn module
- [ ] Write blog article to announce release (dev blogs / dev.to / tech community)
- [ ] Bicep community announcement