docs(codes): Add (key) codes documentation

Create codes documentation for standardized keys.

Closes #218.  Fixes #308.  Ref #21.

docs/src/hid.js

@@ -0,0 +1,20 @@
+/*
+ * Copyright (c) 2020 The ZMK Contributors
+ *
+ * SPDX-License-Identifier: CC-BY-NC-SA-4.0
+ */
+
+import codes from "./data/hid";
+
+export const map = codes.reduce((map, item) => {
+  item.names.forEach((name) => (map[name] = item));
+  return map;
+}, {});
+
+export function getCode(id) {
+  return map[id] ?? null;
+}
+
+export function getCodes(ids) {
+  return ids.reduce((result, id) => [...result, map[id]], []);
+}