Add even more languages

[kjk]

All requested in heyman#10 that have CodeMirror mode.

[davidjhall]

Is this request to add more Markdown or to add more Run Code Block languages? I would like to see Python added to Go, Javascript.

[kjk]

This is just for syntax highlighting of languages.

To execute python I would either have to find a (free) service that has an api for executing python code or run python in the web browser compiled to wasm (not sure if such thing exists).

JavaScript is executed in the browser and for Go I'm using Go project's backend for Go playground.