Switch to the Fang library to improve readability of the manuals #440

[mortymacs]

Some screenshots

Inside Docker, it displays normally without color unless you use the Docker -ti flags:

Resolve #440

[coveralls]

coverage: 53.074% (-2.7%) from 55.775% when pulling 3f57a20a3b3a9efa54e6445dcc932d401226cc3a on switch-to-fang into f43d240b9dde116729baf0dd10c000e32d7b2af7 on main.

[atkrad]

@coveralls help