* skergo.h: use ___ for KC_NO
* skergo.h: use 3-character notation
* skergo.h: add matrix diagram
* add LAYOUT_all macro
* update grid alignment of LAYOUT macro and keymaps
* refactor keymaps
Refactor keymaps to use the `LAYOUT_all` macro. Converts tabs to spaces.
This change necessitates the following changes to keymaps:
- The keycodes for Page Up, Page Down, and End each move up one row - all as the last keys on their new rows.
- The keycode for the secondary B key moves up one row, inserted between the primary (left side) B and the N.
* remove LAYOUT macro
* rename LAYOUT_all macro to LAYOUT_split_bs
* add LAYOUT_2u_bs macro
* readme.md: add flashing example
* info.json: correct maintainer value
Update to reference maintainer's GitHub username.
