• on the configure page where some old unstyled inputs and selects. Those are now jenkins styled.
  Units are shown
• on the disk-usage overview page, the filter form is now styled like Jenkins forms with a correspondingly styled button
• made the svg a symbol (requires Jenkins 2.401.1 as previous lts versions filter out the ids and thus break the svg)
• removed the sidepanel as it contained only a link back to dashboard which is not recommended (see https://weekly.ci.jenkins.io/design-library/Layouts/)
• added a breadcrumb title so we see where we are
• use the bom to get rid of specifying version for some of the dependencies
• use Jenkins 2.401.1

Before:

After:

Testing done

### Submitter checklist
- [x] Make sure you are opening from a **topic/feature/bugfix branch** (right side) and not your main branch!
- [x] Ensure that the pull request title represents the desired changelog entry
- [x] Please describe what you did
- [ ] Link to relevant issues in GitHub or Jira
- [ ] Link to relevant pull requests, esp. upstream and downstream changes
- [ ] Ensure you have provided tests - that demonstrates feature works or fixes the issue