Anne Pro 2 Refactor (#16864)

* move RGB Matrix rules to keyboard level

* move PERMISSIVE_HOLD config to keyboard level

* annepro2.c: convert tabs to spaces

* refactor rules.mk files

Reformats each version's `rules.mk` file to be arranged more similarly to those of the rest of the keyboards in QMK.

No logic change.

* annepro2.c: allow compilation without RGB Matrix

Wraps the `led_enabled` definition and the `KC_AP_RGB_*` keycodes in `#ifdef RGB_MATRIX_ENABLE`, allowing successful compilation if the user sets `RGB_MATRIX_ENABLE = no`.

* rework readme files

Reworks the main `readme.md` file to be more friendly to GitHub viewing, and removes the single-line version-specific readme files (exposes the main readme to QMK Configurator users).

* info.json: update maintainer value

* info.json: apply friendly formatting

keyboards/annepro2/keymaps/default-layer-indicators/config.h

@@ -1,20 +0,0 @@
- /* Copyright 2021 OpenAnnePro community
-  * 
-  * This program is free software: you can redistribute it and/or modify 
-  * it under the terms of the GNU General Public License as published by 
-  * the Free Software Foundation, either version 2 of the License, or 
-  * (at your option) any later version. 
-  * 
-  * This program is distributed in the hope that it will be useful, 
-  * but WITHOUT ANY WARRANTY; without even the implied warranty of 
-  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the 
-  * GNU General Public License for more details. 
-  * 
-  * You should have received a copy of the GNU General Public License 
-  * along with this program.  If not, see <http://www.gnu.org/licenses/>. 
-  */ 
-  
-#pragma once
-
-// Obins stock firmware has something similar to this already enabled, but disabled by default in QMK
-#define PERMISSIVE_HOLD