I have added a default binging of ctrl+/ to toggle the preview in fzf
I have added some git key bindings for git stuff. They are all in the
form with ctrl+g ctrl+<something>. Most are what they want, for example
branches are ctrl+g ctrl+b however commits are not. I assume this is
because I can't overwrite what ctrl+c does, even if prefixed. I will
look into this at some point but for now commits are ctrl+g ctrl+h.
Largely stolen the code from here:
https://gist.github.com/junegunn/8b572b8d4b5eddd8b85e5f4d40f17236
although with minor tweaks.
I might change the initial ctrl+g binding as it is awkward on colemak
although we'll see how often I use it.
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