fix: Add docs for first release

[bvanelli]

• Add how to install via pip (closes #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[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

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

Additional details and impacted files

```diff @@ 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 ```

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