Deprecate this repo

[JordanMartinez]

CC @thomashoneyman

This repo's contents were ported to purescript-numbers and purescript-integers. All core, contrib, web, and node libraries imports and dependencies have been updated to remove this package. Moreover, the upcoming 0.15.0 package set builds without this package. purescript/package-sets#1075

We can now deprecate this repo.

[thomashoneyman]

This should be done once PureScript 0.15 launches. We can update the README, move to purescript-deprecated, delete all the files, and push to Pursuit.

[JordanMartinez]

This is something we can do now.