Add `loafcli` (online loaf cli tool) documentation.

Fix bugs noticed from running stuff similar as below and checking operations and output, and consider that stuff examples of intended usage sort of:

```bash
mkdir -p ~/bin && curl -sL https://tinyurl.com/loafcli -o ~/bin/loafcli && chmod 755 ~/bin/loafcli && loafcli --help
```
