fix: Add docs for first release

[bvanelli]

• Add how to install via pip (closes Generate first alpha version and release to pip #14 )
• Small updates to the README documentation, including example on how to generate server backups
• Add option to delete budgets and test for reupload budget, after exporting it

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.69%. Comparing base (7eecd67) to head (013aded).

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #35      +/-   ##
==========================================
+ Coverage   96.59%   96.69%   +0.09%     
==========================================
  Files          13       13              
  Lines        1704     1725      +21     
==========================================
+ Hits         1646     1668      +22     
+ Misses         58       57       -1     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.