docs: add more readme flair
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# We were only using the minimum amount of flair.

Rendered: https://github.com/canonical/craft-parts/blob/work/more-flair/README.md
- [x] Have you followed the guidelines for contributing?
- [x] Have you signed the [CLA](http://www.ubuntu.com/legal/contributors/)?
- [ ] Have you successfully run `make lint && make test`?
- [ ] Have you added an entry to the changelog (`docs/reference/changelog.rst`)?
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