Add a script (to PATH, so I can launch it from rofi) to take whatever's
in the clipboard, pass it through `dot -Tpng`, and then open the result
with feh.
Change-Id: I1842fca3585a33d902da20dfa6101d1c6d2f2062
Reviewed-on: https://cl.tvl.fyi/c/depot/+/3160
Reviewed-by: grfn <grfn@gws.fyi>
Tested-by: BuildkiteCI
