feat: headless rendering

[aarthificial]

Usage: motion-canvas-renderer [options] <path>  

Arguments:
  path                            path to the project

Options:
  -p, --project <name>            name of the project to render
  -o, --output <path>             path to the output directory
  --product <name>                browser to use (default: "firefox")
  --debug                         enable debug mode
  --background <color>            background color
  --range <from>:<to>             time range in seconds
  --size <width>:<height>         size of the project in pixels
  --fps <number>                  frames per second
  --scale <number>                resolution scale
  --exporter <name>               name of the exporter
  --exportOptions <key=value...>  key-value pairs of export options
  --variables <key=value...>      key-value pairs of project variables
  --variablesJSON <json>          JSON string with project variables
  --variablesFile <json>          Path to a JSON file with project variables
  -h, --help                      display help for command