Revert "adds deepMapKeys snippet"

This reverts commit 73470c50d9.

test/deepMapKeys.test.js

@@ -1,32 +0,0 @@
-const expect = require('expect');
-const { deepMapKeys, toCamelCase } = require('./_30s.js');
-
-test('deepMapKeys is a Function', () => {
-  expect(deepMapKeys).toBeInstanceOf(Function);
-});
-
-test('Deep maps object keys', () => {
-  const obj = {
-    'foo_bar': 'hello',
-    'deep_child': {
-      'child_array': ['hello'],
-      'child_object_array': [
-        { 'hola_hello': 'Gamarjoba' }
-      ]
-    }
-  };
-  const expected = {
-    fooBar: 'hello',
-    deepChild: {
-      childArray: ['hello'],
-      childObjectArray: [
-        {
-          holaHello: 'Gamarjoba'
-        }
-      ]
-    }
-  };
-  const camleCaseKeys = k => toCamelCase(k);
-  expect(deepMapKeys(obj, camleCaseKeys)).toEqual(expected);
-});
-