feat: Remove combos and re-organize symbols layer (#23)

Remove combos used for ESC, tmux, TAB and emojis and move them to symbols layer instead.

Switch key positions between L2 and Backspace.

README.md

@@ -7,8 +7,25 @@ A 36 keys split keyboard layout implemented with [ZMK](https://zmk.dev/).
 The layout is designed for a keyboard with 3x5 main keys plus 3 thumb keys per split
 (e.g. [Corne Keyboard](https://github.com/foostan/crkbd)) and optimized to use VIM and tmux in macOS.
 
+## Layout
+
+The layout design tries to adhere to the following concepts as much as possible:
+
+- Familiarity with a standard keyboard
+- Avoid complexity as much as possible
+- Ergonomic design
+- Wireless ready
+
 ![keyboard-layout](images/layout.png)
 
+### Legend
+
+- PU/PD: Page Up/Page Down
+- 1P: 1Password
+- D1/D2/D3/D4: macOS shortcuts for navigating virtual desktops
+- BP/BN/BC: Bluetooth Previous/Next/Clear
+- tmux: Ctrl + B (tmux shortcut)
+
 ## References
 
 Most of the concepts used in this layout can be found in [rafaelromao](https://github.com/rafaelromao/keyboards)'s repo.

config/corne.keymap

@@ -45,54 +45,6 @@
     };
   };
 
-  combos {
-    compatible = "zmk,combos";
-
-    /**
-     * Key press `LCTRL + B` to enter tmux mode when keys (S) and (D) are tapped.
-     * Only enabled on Alpha layer.
-     */
-    tmux {
-      timeout-ms = <20>;
-      key-positions = <14 15>;
-      bindings = <&kp LC(B)>;
-      layers = <0>;
-    };
-
-    /**
-     * Key press `ESC` when keys (D) and (F) are tapped.
-     * Only enabled on Alpha layer.
-     */
-    escape_key {
-      timeout-ms = <20>;
-      key-positions = <15 16>;
-      bindings = <&kp ESC>;
-      layers = <0>;
-    };
-
-    /**
-     * Key press `TAB' when keys (K) and (L) are tapped.
-     * Enabled on Alpha and NumDir layer.
-     */
-    tab_key {
-      timeout-ms = <20>;
-      key-positions = <20 21>;
-      bindings = <&kp TAB>;
-      layers = <0 2>;
-    };
-
-    /**
-     * Bring up emojis menu in OS X when keys (J) and (K) are tapped
-     * Only enabled on Alpha layer.
-     */
-    emojis_key {
-      timeout-ms = <20>;
-      key-positions = <19 20>;
-      bindings = <&kp LG(LC(SPACE))>;
-      layers = <0>;
-    };
-  };
-
   keymap {
     compatible = "zmk,keymap";
 
@@ -105,19 +57,19 @@
         &none &kp Q &kp W       &kp E       &kp R        &kp T       &kp Y &kp U        &kp I       &kp O       &kp P     &none
         &none &kp A &lhr LALT S &lhr LCMD D &lhr LCTRL F &kp G       &kp H &rhr LCTRL J &rhr LCMD K &rhr LALT L &kp SEMI  &none
         &none &kp Z &kp X       &kp C       &kp V        &kp B       &kp N &kp M        &kp COMMA   &kp DOT     &kp SLASH &none
-                                &mo L2      &kp BSPC     &kp LSHFT   &kp SPACE          &mo L1      &sl L3
+                                &kp BSPC    &mo L2       &kp LSHFT   &kp SPACE          &mo L1      &sl L3
       >;
     };
 
     /**
      * Symbols layer (L1)
      */
     layer_1 {
-      label = "SYMBOLS";
+      label = "RAISE";
       bindings = <
-        &none &kp EXCL &kp AT    &kp HASH  &kp DOLLAR &kp LBKT   &kp RBKT  &kp PLUS  &kp MINUS &kp ASTRK &kp PRCNT &none
-        &none &kp AMPS &kp UNDER &kp DQT   &kp SQT    &kp LPAR   &kp RPAR  &kp ENTER &kp DEL   &kp BSLH  &kp SEMI  &none
-        &none &kp PIPE &kp TILDE &kp CARET &kp GRAVE  &kp LBRC   &kp RBRC  &kp EQUAL &kp COMMA &kp DOT   &kp SLASH &none
+        &none &kp EXCL &kp AT    &kp HASH  &kp DOLLAR &kp LBKT   &kp RBKT  &kp PLUS  &kp MINUS &kp ASTRK         &kp PRCNT &none
+        &none &kp AMPS &kp UNDER &kp DQT   &kp SQT    &kp LPAR   &kp RPAR  &kp ENTER &kp ESC   &kp LC(B)         &kp DEL   &none
+        &none &kp PIPE &kp TILDE &kp CARET &kp GRAVE  &kp LBRC   &kp RBRC  &kp EQUAL &kp TAB   &kp LG(LC(SPACE)) &kp BSLH  &none
                                  &none     &kp BSPC   &kp LSHFT  &kp SPACE &none     &none
       >;
     };
@@ -126,7 +78,7 @@
      * Number and directions layer (L2)
      */
     layer_2 {
-      label = "NUMDIR";
+      label = "LOWER";
       bindings = <
         &none &none        &none    &kp UP   &none     &none          &kp ASTRK  &kp N7 &kp N8 &kp N9 &kp MINUS &none
         &none &kp LA(LEFT) &kp LEFT &kp DOWN &kp RIGHT &kp LA(RIGHT)  &kp SLASH  &kp N4 &kp N5 &kp N6 &kp PLUS  &none