docs(codes): Add (key) codes documentation

Create codes documentation for standardized keys.

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

docs/docs/codes/_keyboard-keypad.mdx

@@ -0,0 +1,59 @@
+import Table from "@site/src/components/codes/Table";
+
+## Keyboard
+
+### Letters
+
+<Table group="keyboard-letters" />
+
+### Numbers
+
+<Table group="keyboard-numbers" />
+
+### Symbols / Punctuation
+
+<Table group="keyboard-symbols" />
+
+### Control & Whitespace
+
+<Table group="keyboard-control-whitespace" />
+
+### Navigation
+
+<Table group="keyboard-navigation" />
+
+### Modifiers
+
+<Table group="keyboard-modifiers" />
+
+### Locks
+
+<Table group="keyboard-locks" />
+
+### F Keys
+
+<Table group="keyboard-fkeys" />
+
+### International
+
+<Table group="keyboard-international" />
+
+### Language
+
+<Table group="keyboard-language" />
+
+### Miscellaneous
+
+<Table group="keyboard-miscellaneous" />
+
+## Keypad
+
+<Table group="keypad" />
+
+### Numbers
+
+<Table group="keypad-numbers" />
+
+### Symbols / Operations
+
+<Table group="keypad-operations" />