New git-filter-repo resource: Cheat Sheets

Hi everyone,

git-filter-repo now has two cheat sheets:
    filter-branch => filter-repo
    bfg repo cleaner => filter-repo

Each lists all the commands from the manual of the command on the
left, and shows the equivalent commands to solve the same problem
using filter-repo.  Links to both cheat sheets can be found at the end
of each tools' section at

https://github.com/newren/git-filter-repo#why-filter-repo-instead-of-other-alternatives


Each cheat sheet is actually half of a bigger guide that also provides
an overview of high level differences between the tools (design
structure, defaults, etc.); just scroll up from each cheat sheet to
see the additional info in the guide.


I hope folks find these useful,
Elijah