fix: install.sh picks the newest editor release and verifies checksums

[Flo0806]

What the title says... now we should be able to install jano on each system, without errors.

Summary by CodeRabbit

• New Features
  • The installer can now install to a custom directory and select a specific editor release.
  • The installer verifies downloads against available checksums and warns when a release has no checksum.

[coderabbitai]

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• public/install.sh

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