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.

universe/crack_the_coding_interview/11_1.py

@@ -1,40 +0,0 @@
-# Implementation for a problem from "Crack the Coding Interview".
-#
-# Dependencies:
-# - python 2.7.16
-# - entr 4.1
-#
-# To run the tests, run: `python 11_1.py`
-# For a tight development loop, run: `echo 11_1.py | entr python /_`
-#
-# Author: William Carroll <wpcarro@gmail.com>
-
-################################################################################
-# Implementation
-################################################################################
-def insert_sorted(xs, ys):
-    """
-    Merges `ys` into `xs` and ensures that the result is sorted.
-
-    Assumptions:
-    - `xs` and `ys` are both sorted.
-    - `xs` has enough unused space to accommodate each element in `ys`.
-    """
-    for y in ys:
-        xi = xs.index(None) - 1
-        yi = xs.index(None)
-        xs[yi] = y
-        while xi != -1 and y < xs[xi]:
-            xs[xi], xs[yi] = xs[yi], xs[xi]
-            xi, yi = xi - 1, yi - 1
-    return xs
-
-################################################################################
-# Tests
-################################################################################
-assert insert_sorted([1, 3, 5, None, None], [2, 4]) == [1, 2, 3, 4, 5]
-assert insert_sorted([None, None], [2, 4]) == [2, 4]
-assert insert_sorted([None, None], [2, 4]) == [2, 4]
-assert insert_sorted([1, 1, None, None], [0, 0]) == [0, 0, 1, 1]
-assert insert_sorted([1, 1, None, None], [1, 1]) == [1, 1, 1, 1]
-print('All tests pass!')