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/permutation-palindrome.py

@@ -1,49 +0,0 @@
-from collections import Counter
-import unittest
-
-
-################################################################################
-# Impl
-################################################################################
-# palindromifiable :: String -> Boolean
-def has_palindrome_permutation(x):
-    bag = Counter(x)
-    odd_entries_ct = 0
-
-    for _, y in bag.items():
-        if y % 2 != 0:
-            odd_entries_ct += 1
-
-    return odd_entries_ct in {0, 1}
-
-
-################################################################################
-# Tests
-################################################################################
-class Test(unittest.TestCase):
-    def test_permutation_with_odd_number_of_chars(self):
-        result = has_palindrome_permutation('aabcbcd')
-        self.assertTrue(result)
-
-    def test_permutation_with_even_number_of_chars(self):
-        result = has_palindrome_permutation('aabccbdd')
-        self.assertTrue(result)
-
-    def test_no_permutation_with_odd_number_of_chars(self):
-        result = has_palindrome_permutation('aabcd')
-        self.assertFalse(result)
-
-    def test_no_permutation_with_even_number_of_chars(self):
-        result = has_palindrome_permutation('aabbcd')
-        self.assertFalse(result)
-
-    def test_empty_string(self):
-        result = has_palindrome_permutation('')
-        self.assertTrue(result)
-
-    def test_one_character_string(self):
-        result = has_palindrome_permutation('a')
-        self.assertTrue(result)
-
-
-unittest.main(verbosity=2)