Document all important services

[PotentialStyx]

Done

WIP

• Chat - Now only used for .draw file multiplayer, but used to power repl chat.
  • Just need to add docs for message history
• Chan0 - Manages channels, and pongs pings.
• OT - Powers file editing.

TODO

• Shellrun2 - Powers the console tab.
• Shell - Powers the shell tab.
• Exec - Let's the client run commands. Powers the git pane, as well as the resource pane.
• GCSFile - Powers the filetree.
• FSEvents - Let's the client know of file modification events.
• dotreplit - Lets the editor read and edit the state of the .replit file.
• toolchain - Lets the client know what LSP's, package managers, debuggers, and run commands are available.
• LSP - Powers code intelligence.
• Presence - Let's the client know who else is in the repl, and what file they are in.
• Audio - Powers non-VNC audio in repls.
• Snapshot - Let's the client tell the server when to snapshot and persist all file changes.
• Packager3 - Powers the packager tab.