Implementing most parts of the Documentation Panel in the new GUI.
Known issues:
- Links do not work (yet, covered by #7992)
- Some pages are entirely empty – I’m investigating. Missing doc sections likely cause this, so we probably want to add some placeholder.
- Tags do not look as in design. I tried implementing them correctly but didn't have enough time to finish everything. Some initial implementation is in place, though. I will create a separate task for them.
https://github.com/enso-org/enso/assets/6566674/a656ae78-5d4c-45f4-a0a5-e07fa573253e