Move thekey to Drop vendor folder (#21032)

keyboards/drop/thekey/keymaps/default/keymap.c

@@ -0,0 +1,7 @@
+// Copyright 2023 Massdrop, Inc.
+// SPDX-License-Identifier: GPL-2.0-or-later
+#include QMK_KEYBOARD_H
+
+const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
+    [0] = LAYOUT(KC_LCTL, KC_C, KC_V)
+};