Add `--no-ansi` option

[gbraad]

While it is nice to forward ansi coloring to tools like fzf, and have them interpret it, I would prefer none of this at all. I did not find an option to disable the coloring.

Workaround

alias remove-ansi="sed -r 's/\x1b\[[0-9;]*m//g'"

vgrep --no-header ... | remove-ansi

[vrothberg]

Thanks for reaching out, @gbraad ! Can you elaborate on why you prefer disabling the colors?

I am asking since coloring is a bit engraved in the code and the idea behind vgrep. If users want a more scripted experiences, I'd probably recommend using ripgrep or git-grep directly. But I am for sure open to change.