[Add function] add 'Split Space and ISO and delete RGUI for Promise 87 (#18929)

* add split space and ISO

* Update wkl.h

* update ISO

* update

* change KC_LGUI to KC_RGUI

* delete RGUI

* format

* update promise87 readme.md

* update promise87 wkl readme.md

* Update readme.md

* Update readme.md

* change KC_SLCK to KC_SCRL

* wuque/promise87/ansi: standardize Layout Macro names

- rename `LAYOUT_tkl_f13_ansi` to `LAYOUT_tkl_f13_ansi_tsangan`
- convert `LAYOUT_tkl_f13_ansi_iso` to `LAYOUT_tkl_f13_iso_tsangan` (adds position `K41`)
- rename `LAYOUT_tkl_f13_ansi_split_space` to `LAYOUT_tkl_f13_ansi_tsangan_split_space`
- rename `LAYOUT_tkl_f13_ansi_split_bs` to `LAYOUT_tkl_f13_ansi_tsangan_split_bs`
- rename `LAYOUT_tkl_f13_ansi_split_lshift` to `LAYOUT_tkl_f13_ansi_tsangan_split_lshift`
- rename `LAYOUT_tkl_f13_ansi_split_rshift` to `LAYOUT_tkl_f13_ansi_tsangan_split_rshift`
- rename `LAYOUT_tkl_f13_ansi_split_bs_rshift` to `LAYOUT_tkl_f13_ansi_tsangan_split_bs_rshift`

* wuque/promise87/wkl: refactor LAYOUT_tkl_f13_ansi_wkl_iso

Refactors `LAYOUT_tkl_f13_ansi_wkl_iso` into `LAYOUT_tkl_f13_iso_wkl` by adding position `K41` (Non-US Backslash) to the layout macro.

Co-authored-by: James Young <18669334+noroadsleft@users.noreply.github.com>

keyboards/wuque/promise87/ansi/readme.md

@@ -1,11 +1,13 @@
 # promise87
 
-More Info at [promise87](https://shop.wuquestudio.com/)
+![Promise87](https://i.imgur.com/0gtouZ2.png)
+
+More Info at [promise87](https://promisetkl.com/)
 ​
 
 * Keyboard Maintainer: [spbgzh](https://github.com/spbgzh)
 * Hardware Supported: promise 87
-* Hardware Availability: [promise87](https://shop.wuquestudio.com/)  
+* Hardware Availability: [promise87](https://promisetkl.com/)  
 ​
 
 Make example for this keyboard (after setting up your build environment):