Convert html help to schelp

[capital-G]

Currently some docs are html exclusive (e.g. Public - https://github.com/supercollider-quarks/JITLibExtensions/blob/main/help/Public.html). It would be great if those would be converted to schelp so these resources become visible within SC-IDE.

[adcxyz]

I found these 4 files:
Client.html, Public.html, RecNodeProxy.html, public_proxy_space.html