Quarkeys Z40 Community Layout Support and Touch-Up (#21329)

* [refactor] rename LAYOUT to LAYOUT_planck_mit

* [style] friendly-format info.json

* [style] refactor keymaps

- grid-align keycodes
- use four-space indent
- remove trailing whitespace

* [chore] tidy-up keyboard data in info.json

- spell-check `manufacturer` value
- use valid `url`
- reference GitHub username for `maintainer`

* [chore] tidy-up readme

- link to maintainer's GitHub account
- add Hardware Availability link
- break-out Hardware Specs into its own section

* [enhancement] enable Community Layout support

* [chore] replace product image in readme

Source repository for previous URL seems to have been deleted.

keyboards/quarkeys/z40/keymaps/via/keymap.c

@@ -15,21 +15,21 @@
 #include QMK_KEYBOARD_H
 
 const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
-    [0] = LAYOUT(
+    [0] = LAYOUT_planck_mit(
         KC_ESC,  KC_Q,    KC_W,    KC_E,    KC_R,    KC_T,    KC_Y,    KC_U,    KC_I,    KC_O,    KC_P,    KC_BSPC,
         KC_TAB,  KC_A,    KC_S,    KC_D,    KC_F,    KC_G,    KC_H,    KC_J,    KC_K,    KC_L,    KC_SCLN, KC_QUOT,
         KC_LSFT, KC_Z,    KC_X,    KC_C,    KC_V,    KC_B,    KC_N,    KC_M,    KC_COMM, KC_DOT,  KC_SLSH, KC_RSFT,
         KC_LCTL, KC_CAPS, KC_LALT, KC_LGUI, MO(1),       KC_SPC,       MO(2),   MO(3),   _______, _______, KC_ENT
     ),
 
-    [1] = LAYOUT(
+    [1] = LAYOUT_planck_mit(
         QK_BOOT, KC_PGUP, KC_HOME, KC_UP,   KC_END,  KC_DEL,  KC_BSLS, KC_7,    KC_8,    KC_9,    RGB_TOG, _______,
         _______, KC_PGDN, KC_LEFT, KC_DOWN, KC_RGHT, KC_PLUS, KC_MINS, KC_4,    KC_5,    KC_6,    RGB_MOD, _______,
         _______, KC_VOLD, KC_VOLU, _______, _______, KC_ASTR, KC_SLSH, KC_1,    KC_2,    KC_3,    RGB_HUI, _______,
         RGB_SAI, RGB_SAD, RGB_VAI, RGB_VAD, _______,     KC_0,         _______, _______, KC_DOT,  RGB_HUD, KC_EQL
     ),
 
-    [2] = LAYOUT(
+    [2] = LAYOUT_planck_mit(
         KC_F1,   KC_F2,   KC_F3,   KC_F4,   KC_F5,   KC_F6,   KC_F7,   KC_F8,   KC_F9,   KC_F10,  KC_F11,  KC_F12,
         _______, KC_AMPR, KC_PIPE, KC_LPRN, KC_RPRN, KC_PLUS, KC_MINS, KC_LCBR, KC_RCBR, KC_LBRC, KC_RBRC, _______,
         _______, KC_EXLM, KC_AT,   KC_HASH, KC_CIRC, KC_ASTR, KC_SLSH, KC_TILD, KC_LABK, KC_RABK, KC_QUES, _______,