Make sure to add fzf + shell integration for maximum Ctrl+r goodness.

Also worth reading the intro to fzf search syntax.

https://junegunn.github.io/fzf/search-syntax.

The $ and bang and exact search are neat, but the bit at the bottom as to why `gadd` or `gas` is a better search for `git add something` than something with full words and spaces is a revelation when first using fzf.