Use FZF to select theme

[dgmora]

I have a slightly different theme script, but it should work with Omakub too. It looks mostly the same and it lets you type.

I am also using fd so that I don't need to add the themes in the script. I'm just showing the folder name though (rose-pine instead of Rose Pine). Happy to add it here.

fd --max-depth 1 . "$OMAKUB_PATH/themes" -X basename {} \;