Add sub-commands and run from relative path

### Running an app

- With sub-commands
  - `$ maleo run path/to/app`
  - `$ cd path/to/app`
  - `$ maleo run`
- Without sub-commands
  - `$ maleo path/to/app`
  - `$ cd path/to/app`
  - `$ maleo`

### Asking for help
- Everything
  - `$ maleo help`
- A particular command
  - `$ maleo help run`