* sinanju.h: add matrix diagram
* add LAYOUT_60_ansi_wkl_split_bs_rshift macro
Same matrix as `LAYOUT_all`, but with position K2D (right half of split Backspace) moved to the end of the top row.
* refactor keymaps
- use `LAYOUT_60_ansi_wkl_split_bs_rshift` macro instead of `LAYOUT_all`
- polish four-space indent
- update grid alignment
- replace `RESET` keycode with `QK_BOOT`
* remove now-unused LAYOUT_all macro
* add LAYOUT_60_ansi_wkl macro with keymap
Add a layout with 2u Backspace and 2.75u right Shift.
* info.json: correct maintainer value
