add: start page for admin

[lizable]

Checklist: (if applicable)

• [ ] Mention to the original issue
• [ ] Documentation
• [ ] Minium required manager version
• [ ] Specific setting for review (eg., KB link, endpoint or how to setup)
• [ ] Minimum requirements to check during review
• [ ] Test case(s) to demonstrate the difference of before/after

[graphite-app[bot]]

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[lizable]

[!WARNING] This pull request is not mergeable via GitHub because a downstack PR is open. Once all requirements are satisfied, merge this PR as a stack on Graphite. Learn more

• #2753
• #2675 👈
• #2668 : 3 other dependent PRs (#2670 , #2672 , #2677 )
• #2745
• main

This stack of pull requests is managed by Graphite. Learn more about stacking.

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