Complete writing comprehensive automation tests

[karkarl]

### Tasks
- [x] Accessibility test passes for each page
- [x] Navigate to each page and scroll to the end (to catch any crash style regression)
- [ ] Check validity of each link

[citelao]

I'd be happy to consult on this (I'm an accessibility champ for DASH); let me know!

[marcelwgn]

I'm curios if the validity link checking should be done as an automation test or if this should be a build step that just checks all links we added during compilation.

[marcelwgn]

Regarding build step, one could probably look how terminal implemented their URL detection and use that to validate all links contained in the source code.