Add a Changelog and automatic semantic versioning

[CalvinRodo]

Add a changelog that uses the following format:

https://keepachangelog.com/en/1.0.0/

We can leverage the deleted FORK.md and documentation from CovidShield to prime it.

Acceptance criteria:

• [ ] New PRs automagically update changelog
• [ ] Changelog gets reconciled with version in master
• [ ] GitHub automatically tags code with newest semantic version

[maxneuvians]

This is a more detailed audit of all the changes made to the server and allows somebody to review the changes chronologically. Using proper version numbers you could also have a much tighter release management process.

[stephenyates-gc]

Estimated effort is a day or two of research and implementation.

[CalvinRodo]

We might have to remove the requirement that branch protection rules apply to admins. We might want to have a couple of dedicated admin accounts for not only CI automation but also to ensure that we don't accidentally push to the main branch.