Splice ./universe directory into ./

Manually merging:
- README.md: I added the description from universe/README.md into the heading of
  dotfiles/README.md.
- .envrc: dotfiles/.envrc was a superset of universe/.envrc
- .gitignore: Adding some of the ignored patterns from universe/.gitignore to
  dotfiles/.gitignore

Everything else here should be a simple rename.

haskell-file/tests.hs

@@ -0,0 +1,39 @@
+module FTest where
+--------------------------------------------------------------------------------
+import Test.Tasty
+import Test.Tasty.Hedgehog
+import Hedgehog
+--------------------------------------------------------------------------------
+import qualified Hedgehog as H
+import qualified Hedgehog.Gen as Gen
+import qualified Hedgehog.Range as Range
+--------------------------------------------------------------------------------
+import Data.List (intercalate)
+import System.FilePath (pathSeparator)
+--------------------------------------------------------------------------------
+import F
+--------------------------------------------------------------------------------
+main :: IO ()
+main
+  = defaultMain
+  . localOption (HedgehogTestLimit $ Just 50)
+  $ testGroup "f functions"
+  [ test_split
+  ]
+--------------------------------------------------------------------------------
+test_split :: TestTree
+test_split
+  = testGroup "split function"
+  [ testProperty "splits parts properly" splitSuccess
+  ]
+splitSuccess :: Property
+splitSuccess = property $ do
+  -- separator
+  --   <- H.forAll
+  --   $ Gen.element ['/', '\\']
+  parts
+    <- H.forAll
+    . Gen.list (Range.linear 0 10)
+    $ Gen.list (Range.linear 1 10) Gen.alphaNum
+  let path = intercalate [pathSeparator] parts
+  F.split path === parts