Updated release process to be automated

[frederikprijck]

Description

Update release process to be automated by adding the required workflow and actions, as well as a .version file.
This also adds a current-working directory to the publish command to ensure we publish the correct files.

This also ensures we can use npm run build for the production build rather than npm run build:prod.

Additionally, I removed some files that are no longer used.

Checklist

• I have added documentation for new/changed functionality in this PR or in auth0.com/docs
• All active GitHub checks for tests, formatting, and security are passing
• The correct base branch is being used, if not the default branch