mgr/dashboard: remove unncessary hyperlink in landing page

[nizamial09]

Fixes: https://tracker.ceph.com/issues/59462

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Checklist

• Tracker (select at least one)
  • References tracker ticket
  • Very recent bug; references commit where it was introduced
  • New feature (ticket optional)
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  • Affects Dashboard, opened tracker ticket
  • Affects Orchestrator, opened tracker ticket
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  • Updates relevant documentation
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