Release v0.6.5

[fizruk]

This version contains mostly intrastructure improvements:

• Typecheck using rzk.yaml if it exists (see #119)
• Update Rzk Playground and Nix Flake (see #84)
  • Rzk Playground now uses CodeMirror 6 and NextJS
  • miso dependency is dropped
  • GHCJS 9.6 is now used
  • Support snippet={code} or code={code} param (see #118)
    • Support for snippet_url={URL} is temporarily dropped
• Update to GHC 9.6, latest Stackage Nightly, improve Rzk setup, and GitHub Actions (see #116)
• Add logging for Rzk Language Server (see #114)

Fixes:

• Fix error messages in Rzk Playground (see #115)