Documentation and Guides workflow doesn't run for all push events

[astrogeco]

Describe the bug
The "documentation and guides" CI workflow still has the old push->main branch restriction so it won't run on other branches in forks.

To Reproduce
Create a new branch and push to it. The documentation workflow will not run

Expected behavior
Workflow should run on all branches

Code snips

on:
  push:
    branches:
      - main

  pull_request:

System observed on:
Github UI

Additional context
See #224 for how to run on all branches without duplicates