sillyCase: only apply/alternate on alpha chars

I noticed that punctuation were getting "toggled" which then perturbed
the alternation of next alpha char.

cabal2nix

add other text modes & options parsing to choose them

readme: stylize lowercase

bump base version, update cabal2nix

bump to new nixpkgs/ghc

set up for nix-direnv

flake-ify

- add flake.nix
- drop legacy nix files
- add shell.nix devShell shim (for legacy nix)
- add .envrc (lorri / nix-direnv)
- cabal2nix now uses new stdenv location

type annotations

revamp to use cabal2nix

this seems more appropriate for small projects, at the sizes I'm
working. I think that haskell.nix is aimed more for large projects and
large teams of devs?

update to use new `compiler-nix-name`

Document binary caches

Add `default.nix` to build `uncap`

README tweaks

Init