MLIR Toy tutorial should be self contained in another repository

[peledins-zimperium]

This came out of Euro LLVM 2024 newcomer improvement roundtable

Problem is that getting toy tutorial to run is hard.

Toy tutorial could be self-contained in a separate repository; s.t. it is obvious how to do self-contained enlist, build and run it, w/o guessing. Result would be a new repository with a documentation somewhere that starts with enlisting into LLVM and finishes with running chapter one of tutorial.