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/data_structures_and_algorithms/norman.py

@@ -1,78 +0,0 @@
-
-
-
-# Write a function with the following type signature:L
-# equal? :: String -> String -> Bool
-#
-# Determine equality between two inputs with backspace characters encoded as
-# "<".
-
-################################################################################
-# Solution 1
-################################################################################
-
-# from collections import deque
-
-# def equal(a, b):
-#     sa = deque()
-#     sb = deque()
-
-#     for c in a:
-#         if c == '<':
-#             sa.pop()
-#         else:
-#             sa.append(c)
-
-#     for c in b:
-#         if c == '<':
-#             sb.pop()
-#         else:
-#             sb.append(c)
-
-#     return sa == sb
-
-################################################################################
-# Solution 2
-################################################################################
-
-def handle_dels(num_dels, i, xs):
-    if i < 0:
-        return -1
-
-    while xs[i] == '<':
-        num_dels += 1
-        i -= 1
-
-    while num_dels > 0 and xs[i] != '<':
-        num_dels -= 1
-        i -= 1
-
-    if xs[i] == '<':
-        return handle_dels(num_dels, i, xs)
-    else:
-        return i
-
-def update_index(i, xs):
-    # TODO: Indexing into non-available parts of a string.
-    if xs[i] != '<' and xs[i - 1] != '<':
-        return i - 1
-
-    elif xs[i - 1] == '<':
-        return handle_dels(0, i - 1, xs)
-
-def equal(a, b):
-    ia = len(a) - 1
-    ib = len(b) - 1
-
-    while ia >= 0 and ib >= 0:
-        if a[ia] != b[ib]:
-            return False
-        ia = update_index(ia, a)
-        ib = update_index(ib, b)
-
-    if ia != 0:
-        return update_index(ia, a) <= -1
-    if ib != 0:
-        return update_index(ib, b) <= -1
-
-    return True