upgrade dependencies, license comment block fixed, spago2nix

Package upgrades and other housekeeping

* Upgrade to the latest package-set
* Include scripts to upgrade package-set
* Fix editorconfig and spacing
* Add CONTRIBUTORS.dhall
* Prepend `!` to license

Relicense, upgrade packages, reformat, add tooling

* BSD 3-Clause → MPL 2.0
* PureScript 0.14.2 → 0.14.4
* purty → purs-tidy
* other updates to Nix and more

update banner + flake update

upgrade to PureScript v0.14

move main repo to SourceHut

upgrades

upgrade deps

spago upgrade

spin

update readme

license stuff

Add LICENSE

dhall

init