update styling

[mawinter69]

• 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

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6. Ensure you have provided tests - that demonstrates feature works or fixes the issue

[froque]

nice, thanks