Release Rhapsode 4!

Add introductory messages.

Release Rhapsode v3 with hyperlinks

Specify the fallback license for the sound effects.

I was prompted to do some digging to find this.
elementary though relicenses it under the Unlicense.

Release Rhapsode2!

Implement Gemini!

Refactor Rhapsode to use new HURL APIs and more leniantly handle MIMEtypes.