docs: update readme with bulletpoints and updates keys and routine updates

[koalalorenzo]

Adds a clear bullet point in the README about use cases and explains who it is for (kinda).

Updates dependencies/flake lock, and updates age keys and encryption. Routine stuff.

[github-actions]

Dependency Review

✅ No vulnerabilities or license issues or OpenSSF Scorecard issues found.

OpenSSF Scorecard

Package	Version	Score	Details
npm/@types/bun	1.3.13	🟢 6.5	Details Check Score Reason Code-Review 🟢 8 Found 25/29 approved changesets -- score normalized to 8 Packaging ⚠️ -1 packaging workflow not detected Maintained 🟢 10 30 commit(s) and 0 issue activity found in the last 90 days -- score normalized to 10 CII-Best-Practices ⚠️ 0 no effort to earn an OpenSSF best practices badge detected Token-Permissions ⚠️ 0 detected GitHub workflow tokens with excessive permissions Dangerous-Workflow 🟢 10 no dangerous workflow patterns detected Security-Policy 🟢 10 security policy file detected License 🟢 9 license file detected Signed-Releases ⚠️ -1 no releases found Branch-Protection ⚠️ -1 internal error: error during branchesHandler.setup: internal error: some github tokens can't read classic branch protection rules: https://github.com/ossf/scorecard-action/blob/main/docs/authentication/fine-grained-auth-token.md Pinned-Dependencies 🟢 8 dependency not pinned by hash detected -- score normalized to 8 Binary-Artifacts 🟢 10 no binaries found in the repo SAST ⚠️ 0 SAST tool is not run on all commits -- score normalized to 0 Fuzzing ⚠️ 0 project is not fuzzed
npm/bun-types	1.3.13	Unknown	Unknown

Scanned Files

• package-lock.json