Add color output to CLI/HTML

Only if CLI support it.
Check if `TERM` env var is something like: '*-color' or '*-256color'.
HTML always have colors.
We need:
- `normal` text for `normal` messages
- `gray` for `debug`,
- `green` for `success` or `good` state,
- `yellow` for `warning`,
- `red` for `errors` or `bad` state

NOT enabled by default. Maybe.