docs: add docs for functions

docs/bait.txt

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+catch(name, cb) > Catches a hook with `name`. Runs the `cb` when it is thrown
+
+throw(name, ...args) > Throws a hook with `name` with the provided `args`
+

docs/commander.txt

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+deregister(name) > Deregisters any command registered with `name`
+
+register(name, cb) > Register a command with `name` that runs `cb` when ran
+

docs/fs.txt

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+cd(dir) > Changes directory to `dir`
+
+mkdir(name, recursive) > Makes a directory called `name`. If `recursive` is true, it will create its parent directories.
+
+readdir(dir) > Returns a table of files in `dir`
+
+stat(path) > Returns info about `path`
+

docs/global.txt

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+alias(cmd, orig) > Sets an alias of `orig` to `cmd`
+
+appendPath(dir) > Appends `dir` to $PATH
+
+exec(cmd) > Replaces running hilbish with `cmd`
+
+goro(fn) > Puts `fn` in a goroutine
+
+interval(cb, time) > Runs the `cb` function every `time` milliseconds
+
+multiprompt(str) > Changes the continued line prompt to `str`
+
+ prompt(str) > Changes the shell prompt to `str`
+There are a few verbs that can be used in the prompt text.
+These will be formatted and replaced with the appropriate values.
+`%d` - Current working directory
+`%u` - Name of current user
+`%h` - Hostname of device
+
+timeout(cb, time) > Runs the `cb` function after `time` in milliseconds
+

docs/hilbish.txt

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+cwd() > Returns the current directory of the shell
+
+flag(f) > Checks if the `f` flag has been passed to Hilbish.
+
+run(cmd) > Runs `cmd` in Hilbish's sh interpreter
+