[Keyboard] refactor signum30 (#14527)

Co-authored-by: Drashna Jaelre <drashna@live.com>
Co-authored-by: Ryan <fauxpark@gmail.com>
Co-authored-by: Stan Gurenkov <stan.gurenkov@docusign.com>

keyboards/signum/3_0/keymaps/default/km_template.txt

@@ -0,0 +1,20 @@
+/* keymap.c is auto-generated, don't edit it directly.
+ * Further instructions are provided in readme.md */
+
+#include QMK_KEYBOARD_H
+
+enum unicode_name {
+//<enum/>
+};
+
+const uint32_t PROGMEM unicode_map[] = {
+//<uc_map/>
+};
+
+const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
+
+//<keymaps/>
+};
+
+/* vi: ft=c:tw=80:sw=2:ts=2:sts=2:et
+ */