feature request: add support for all flags in the configuartion

**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](https://github.com/charmbracelet/glow/blob/67243bb6fbf6d49eddb6ab644e8e2c1395f9cb00/README.md?plain=1#L166-L172), 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`](https://github.com/charmbracelet/glow/blob/67243bb6fbf6d49eddb6ab644e8e2c1395f9cb00/main.go#L40-L41)

**Additional context**
related to #642

Start with the configuration section in README.md and the flag definitions and permutations in main.go. Compare the supported configuration entries with flags such as --preserve-new-lines and --line-numbers, including the EDITOR environment variable; done means the requested flags can be configured consistently and the related behavior is covered.

Written by the indexing model from the issue text.