## Description of Changes
Adds updates to the Contributing and Style Guide docs to note:
- You must provide either an alternative or a last untainted commit/version
- You can only have a maximum of 5 currently open Pull Requests (after your PRs or merged or closed, you're free to open more)
- There should be a break between in the title for the "last untainted version/commit" column
- There can be *both* a last untainted version AND last untainted commit, but if you can only provide one, prefer the version
- Update "evidence and tags" column to just be "evidence"
We also update the PR template to add a check box to ensure that either an alternative or a last untainted commit/version is provied.
### Related Issues
- closes#1050
- closes#1090
Reviewed-on: https://codeberg.org/ethical-foss/open-slopware/pulls/1097
