Remove custom and admin tabs

[Angatupyry]

What's new

• Tabs and routes are removed

Self-checks

• I have prototyped this new feature (if necessary) on Figma
• I'm familiar with and follow this Typescript guideline
• I added unit-tests for new components
• I tried testing edge cases
• I tested the behavior of the components that interact with the backend, with an e2e test

Discussion

[codecov]

Codecov Report

Merging #744 (9df2ea8) into deploy/hammer (d755f14) will increase coverage by 0.01%.
Report is 1 commits behind head on deploy/hammer.
The diff coverage is n/a.

@@                Coverage Diff                @@
##           deploy/hammer     #744      +/-   ##
=================================================
+ Coverage          54.65%   54.66%   +0.01%     
=================================================
  Files                263      263              
  Lines               6528     6523       -5     
  Branches             862      860       -2     
=================================================
- Hits                3568     3566       -2     
+ Misses              2820     2817       -3     
  Partials             140      140              

Flag	Coverage Δ
dashboard	18.39% <ø> (-0.06%)	⬇️

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Files Changed	Coverage Δ
packages/dashboard/src/components/app.tsx	0.00% <ø> (ø)
packages/dashboard/src/components/appbar.tsx	31.84% <ø> (-0.20%)	⬇️

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[aaronchongth]

Thanks! LGTM