Improve Github Action Workflow for website deployment

[felixfaassen]

Currently the deployment workflow is triggered when there is a push on the develop branch. (after a successful reviewed pull request). The deploy Github action will then issue a build and add the files from the /public directory to the master repository using a forced push. This leaves the master repo only filled with the contents of the build files in stead of the entire repo.

We should fix this so the Github Action does not rely on this mechanism