Add a proper Main.hs for Worksheet01 tests
Cleanup haskell-workshop.cabal, so that all modules can be imported on the repl
Add some instructions for the first slide
Expose all 'Worksheet' modules in .cabal file
Fix module declaration in Worksheet01.hs
Add proper path of test code for Worksheet01 tests
Type-annotate some strings in Worksheet01 to get them working with ghci
Add updated slides
Remove Beginning.hs and Beginning/Internal.hs