Stello65 Beta Layout Additions and Clean-Up (#20824)

* add matrix_diagram.md

* info.json: apply friendly formatting

* remove encoder hack

Converts the rotary encoder hack to Encoder Map with QMK Configurator fallback.

* add LAYOUT_65_ansi_blocker_split_bs

* add LAYOUT_65_ansi_blocker

* add LAYOUT_65_ansi_blocker_tsangan_split_bs

* add LAYOUT_65_ansi_blocker_tsangan

* add LAYOUT_65_iso_blocker

* add LAYOUT_65_iso_blocker_split_bs

* add LAYOUT_65_iso_blocker_tsangan_split_bs

* add LAYOUT_65_iso_blocker_tsangan

* enable Community Layout support

* Apply suggestions from code review

keyboards/stello65/beta/beta.c

@@ -2,15 +2,17 @@
 // SPDX-License-Identifier: GPL-2.0-or-later
 
 #include "quantum.h"
-#include "encoder_actions.h"
-
-void matrix_scan_kb(void) {
-    encoder_action_unregister();
-    matrix_scan_user();
-}
 
+#if defined(ENCODER_ENABLE)
 bool encoder_update_kb(uint8_t index, bool clockwise) {
     if (!encoder_update_user(index, clockwise)) { return false; }
-    encoder_action_register(index, clockwise);
+    if (index == 0) {
+        if (clockwise) {
+            tap_code_delay(KC_VOLU, 10);
+        } else {
+            tap_code_delay(KC_VOLD, 10);
+        }
+    }
     return true;
-};
+}
+#endif