[Keyboard] KBDfans Bella RGB ANSI and Bella RGB ISO (#11438)
* add bella rgb keyboards
* Update rgb_iso.c
* fix error
* Update rgb_iso.h
* Update keyboards/kbdfans/bella/rgb/rules.mk
* Update keyboards/kbdfans/bella/rgb_iso/rules.mk
* Update keymap.c
* Update keyboards/kbdfans/bella/rgb/info.json
* Update keyboards/kbdfans/bella/rgb_iso/info.json
* Update keyboards/kbdfans/bella/rgb_iso/config.h
* Update keyboards/kbdfans/bella/rgb/config.h
* Update keyboards/kbdfans/bella/rgb_iso/rules.mk
* Update keyboards/kbdfans/bella/rgb_iso/rules.mk
* Update keyboards/kbdfans/bella/rgb_iso/rules.mk
* Update keyboards/kbdfans/bella/rgb/rules.mk
* Update keyboards/kbdfans/bella/rgb/rules.mk
* Update keyboards/kbdfans/bella/rgb/rules.mk
* Update rgb_iso.c
* Update rgb.c
* Update rgb_iso.c
* Update rgb_iso.h
* Update keyboards/kbdfans/bella/rgb/config.h
* Update keyboards/kbdfans/bella/rgb/rgb.h
* Update keyboards/kbdfans/bella/rgb/info.json
* Update keyboards/kbdfans/bella/rgb/info.json
* Update keyboards/kbdfans/bella/rgb/keymaps/default/keymap.c
* Update keyboards/kbdfans/bella/rgb_iso/keymaps/via/keymap.c
* Update keyboards/kbdfans/bella/rgb_iso/keymaps/via/keymap.c
* Update keyboards/kbdfans/bella/rgb_iso/readme.md
* Update keyboards/kbdfans/bella/rgb_iso/readme.md
* Update keyboards/kbdfans/bella/rgb_iso/readme.md
* Apply suggestions from code review
kbdfans/bella/rgb: Change remaining instances of LAYOUT_all to LAYOUT
* Apply suggestions from code review
kbdfans/bella/rgb: update readme
- update keyboard name
- include flashing and bootloader instructions
* Apply suggestions from code review
kbdfans/bella/rgb_iso: update keyboard name
Changes remaining instances of "BELLA_RGB_ISO" to "BELLA RGB ISO".
* Apply suggestions from code review
kbdfans/bella/rgb_iso: Change LAYOUT_all to LAYOUT
* Apply suggestions from code review
kbdfans/bella/rgb_iso: Move ISO Enter's keycode to home row per QMK standard
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