feat(PWA): hide button if installed

[felix-berlin]

No description provided.

[what-the-diff]

PR Summary

• Addition of 'Installed' Paragraph Slot in 'Footer.astro' File
  In the Footer.astro file, there is now a new section called the "installed" slot. This is part of the InstallApp component, and gives us a new area where we can share additional information. This could be used for a number of purposes, such as explaining the installation status of the app, providing instructions for next steps, or conveying any relevant updates.

[codecov]

Codecov Report

Attention: 17 lines in your changes are missing coverage. Please review.

Comparison is base (8a9c222) 15.62% compared to head (5c89471) 15.73%.

Files	Patch %	Lines
src/components/InstallApp.vue	0.00%	11 Missing ⚠️
src/stores/installApp.ts	57.14%	6 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #233      +/-   ##
==========================================
+ Coverage   15.62%   15.73%   +0.10%     
==========================================
  Files          61       61              
  Lines        3986     4010      +24     
  Branches       71       71              
==========================================
+ Hits          623      631       +8     
- Misses       3313     3329      +16     
  Partials       50       50              

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[felix-berlin]

🎉 This PR is included in version 3.1.0 🎉

The release is available on GitHub release

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