Include Release Notes somewhere in the docs

[BennyDeBock]

As Vapor and surrounding packages get updates, these updates might not always be directly reflected in the documentation. Hence why it might be interesting to include the releases made by the release bot in a seperate file. This way, people can easily find the release notes for whatever package they need and look for updates in the docs.

Things to be included on a release are:

• The title of the release
• The description of the release
• A link to the release/PR in question

I think the best way this can be done is by creating a re-usable workflow that automatically adds this to the documentation.