feature request: add support for all flags in the configuartion

[electriquo]

Is your feature request related to a problem? Please describe.
i am frustrated when i need to supply flags, e.g. --preserve-new-lines and --line-numbers, to glow all the time. i tried to utilize glow configuration, but it seems that the configuration lacks support for all flags (including EDITOR environment variable)

Describe the solution you'd like
add support to configure all flags in the configuration if it is not supported already. otherwise, improve the

Describe alternatives you've considered

• adding line-numbers: true to the configuration and any other permutations driven by main.go

Additional context
related to #642