📚 Write user docs

[shnizzedy]

theo --help
theo schedule --help
theo run --help

all work (current outputs below), but we should provide some documentation on the web too.

usage: theo [-h] [--version] [-v] [-vv] {scheduler,run} ...

theodore: a C-PAC utility

positional arguments:
  {scheduler,run}

optional arguments:
  -h, --help           show this help message and exit
  --version            show program's version number and exit
  -v, --verbose        set loglevel to INFO
  -vv, --very-verbose  set loglevel to DEBUG

usage: theo scheduler [-h] [--address ADDRESS]
                      [--backend {docker,singularity} [{docker,singularity} ...]]

optional arguments:
  -h, --help            show this help message and exit
  --address ADDRESS
  --backend {docker,singularity} [{docker,singularity} ...]

usage: theo run [-h] [--address ADDRESS] [--backend {docker,singularity}]
                data_config [pipeline]

positional arguments:
  data_config
  pipeline

optional arguments:
  -h, --help            show this help message and exit
  --address ADDRESS
  --backend {docker,singularity}

[shnizzedy]

These docs should include where to find theo's working and outputs directories. As of 344dea3, I believe those are tempfile.mkdtemp directories in /tmp.