New version of about/overview/administration page

[mlqn]

Description

Related Issue(s)

• Implement new page with placeholders #11155

Verification

• Your code builds clean without any errors or warnings
• Manual testing done (required)
• Relevant automated test added (if you find this hard, leave it and we'll help out)
• Cypress tests run green locally (https://github.com/Altinn/altinn-studio/tree/master/frontend/testing/cypress#run-altinn-studio-tests)

[codecov]

Codecov Report

Attention: 3 lines in your changes are missing coverage. Please review.

Comparison is base (b58d2c4) 81.53% compared to head (b9a0f07) 81.53%.
Report is 4 commits behind head on master.

❗ Current head b9a0f07 differs from pull request most recent head 45271bb. Consider uploading reports for the commit 45271bb to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##           master   #11258   +/-   ##
=======================================
  Coverage   81.53%   81.53%           
=======================================
  Files         808      809    +1     
  Lines       12155    12170   +15     
  Branches     1609     1612    +3     
=======================================
+ Hits         9910     9923   +13     
- Misses       2006     2007    +1     
- Partials      239      240    +1     

Files	Coverage Δ
...administration/components/LegacyAdministration.tsx	100.00% <100.00%> (ø)
...dministration/components/ServiceAdministration.tsx	94.44% <100.00%> (-0.11%)	⬇️
...app-development/hooks/queries/useAppConfigQuery.ts	100.00% <100.00%> (ø)
...nd/packages/shared/src/utils/featureToggleUtils.ts	87.17% <ø> (ø)
frontend/app-development/config/routes.tsx	91.66% <66.66%> (-8.34%)	⬇️
...tures/administration/components/Administration.tsx	85.71% <81.81%> (-9.94%)	⬇️

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[framitdavid]

Very nice work! 🚀 Just a few small comments for consideration. 😊

[framitdavid]

👏