Clarify empty states on security dashboards

Problems

Based on the issue about day 1 experiences: #34369 (comment 279699498) Certain copies need to improve in the following situations:

• Instance level dashboard:
  
  • Title/Explanation copy: Tells the user exactly why the dashboard is empty: no scans enabled / no vulnerabilities found/ no projects added?
    
  • CTA: Should it lead to the docs pages? If so, should it be a high level page or a sublinked section of that page? Or it should it link to the configuration page?
    

• Group level dashboard:
  
  • Title/Explanation copy: Tells the user exactly why the dashboard is empty: no scans enabled / no vulnerabilities found/ no projects added?
    
  • CTA: Should it lead to the docs pages? If so, should it be a high level page or a sublinked section of that page? Or it should it link to the configuration page?
    

• Project level dashboard:
  
  • Title/Explanation copy: Tells the user exactly why the dashboard is empty: no scans enabled / no vulnerabilities found?
    
  • CTA: Should it lead to the docs pages? If so, should it be a high level page or a sublinked section of that page? Or it should it link to the configuration page?
    

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Note: the following has been moved to #215504 (closed)

* Dependency page:
* Title/Explanation copy: Tells the user exactly why the dashboard is empty because no scans setup or because nothing has been scanned yet?
* CTA: it should be documentation of dashboard in general? or it should be documentation of how to setup? or it should be linked to configuration page?