Create full release CD via github actions

[rpanic]

Create a release flow where we can trigger releases via github that do a bunch of things:

• Build and release via lerna on npmjs
• Trigger a workflow on the website to rebuild and redeploy itself (maybe by creating a PR as well, not sure)
• For changelog ideas see Introduce a standard way to deal with changelogs #159
  They should generally be triggered by opening a PR, attaching a tag to it (or something like that). That PR should contain at the minimum a update of changelog to incorporate the new release number (this is assuming the release flow takes care of incrementing the package.json version numbers
  https://github.com/release-flow/keep-a-changelog-action