fix(illustrations): use svg images from keyboard-drawer

README.md

@@ -45,7 +45,7 @@ base with GASC homerow mods.
 
 The base layer looks like this:
 
-![Base Layer](./img/Layer-0.png)
+![Base Layer](./img/Layer-0.svg)
 
 `PERMISSIVE_HOLD` is disabled on home row keys to avoid false positive on rolls,
 and enabled for thumb keys as there are few false positives in this case.
@@ -53,18 +53,24 @@ and enabled for thumb keys as there are few false positives in this case.
 The internal thumb keys move to the nav/numpad layer on hold or space/tap on
 tap. This layer is the following:
 
-![Num-Nav Layer](./img/Layer-1.png)
+![Num-Nav Layer](./img/Layer-1.svg)
 
-Finally, pressing both internal thumb keys (or left external one) leads to the
+Finally, holding both internal thumb keys (or holding left external one) leads to the
 function/mouse nav layer:
 
-![Num-Nav Layer](./img/Layer-2.png)
+![Fun-Mouse Layer](./img/Layer-2.svg)
 
 This layer also allows accessing custom layers, such as here layer 3 that is the
 `qwerty-ergol` compatibility layer or the layer 4 which is a gaming layer (not
 described here).
 
+When I’m using multiple xkeyboard layouts, my shortcut to switch between them is
+double shifts, that’s why there is also a binding for that (and why it’s the
+only one that is symmetrically correct in the homerow mods in the base layer).
+
+The illustrations were made using
+[keymap-drawer](https://github.com/caksoylar/keymap-drawer/tree/main).
+
 ## Left to do
 
-- [ ] Replace `png` images with `svg`
 - [ ] Automatize the firmware generations