- Fix links; linkt to dataport nodes

- Initially, I just wanted to replace taurusexport command
- It ended up with a review of the Mathematica stuff

- Start filling the Power9 page
- Change links within documentation to point to hardware overview
  section

- Architecture and hardware is well documented on hardware overview page
- Documentation of Slurm, Workspaces and Filesystems are not special to
  Barnard; thus, users should read the corresponding pages
- Currently, we do not have a special topic that needs to covered on a
  separate Barnard page
- Reduce complexity of documentation
- Fix links; Link to subsection "Barnard" in hardware overview page

- Remove outdated content
- Update content
- Change tense to present

- Add Capella
- Add links to hardware overview for all mentioned cluster

- Remove outdated note on SSD storage
- Refine note on node-local storage

- Address reader/user

Co-authored-by: Jan Frenzel <jan.frenzel@tu-dresden.de>

Co-authored-by: Jan Frenzel <jan.frenzel@tu-dresden.de>

Co-authored-by: Jan Frenzel <jan.frenzel@tu-dresden.de>

Co-authored-by: Jan Frenzel <jan.frenzel@tu-dresden.de>

Co-authored-by: Jan Frenzel <jan.frenzel@tu-dresden.de>

Co-authored-by: Jan Frenzel <jan.frenzel@tu-dresden.de>

- Merge functionality of two check links scripts into one
- Document usage of the script when working with docker container