Updated install target, and corresponding uninstall target.
Remove large outdated chunks of README.
Remove pandoc-tangle submodule.
Format dockerfile a bit better.
Remove order-only dependencies on build step for test step in Makefile (so that you can run the makefile using a globally installed KIELE, for example).
Fixes: runtimeverification/iog-pm#29
I pulled these out of #216 .
install
target, and correspondinguninstall
target.