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.

.gitignore

@@ -17,5 +17,12 @@ Vundle.vim
 **/*/.emacs.d/custom.el
 **/*/.emacs.d/projectile-bookmarks.eld
 **/*/.emacs.d/bookmarks
-__pycache__/
 **/*/transient/history.el
+
+# Haskell
+*.hi
+*.o
+
+# Python
+__pycache__
+*.class