[Keyboard] Move Ergodox STM32 to handwired folder (#24903)

* [Keyboard] Move Erogdox STM32 to handwired folder

To minimize confusion with ZSA's ergodox EZ ST (stm32f303) and because this is basically a one-off board

* Don't forget mapping

* Fix readme

data/mappings/keyboard_aliases.hjson

@@ -197,6 +197,9 @@
     "ergodone": {
         "target": "ktec/ergodone"
     },
+    "ergodox_stm32": {
+        "target": "handwired/ergodox_stm32"
+    },
     "ergoinu": {
         "target": "dm9records/ergoinu"
     },

keyboards/handwired/ergodox_stm32/readme.md

@@ -4,6 +4,6 @@
 
 Make example for this keyboard (after setting up your build environment):
 
-    make ergodox_stm32:default
+    make handwired/ergodox_stm32:default
 
 See the [build environment setup](https://docs.qmk.fm/#/getting_started_build_tools) and the [make instructions](https://docs.qmk.fm/#/getting_started_make_guide) for more information. Brand new to QMK? Start with our [Complete Newbs Guide](https://docs.qmk.fm/#/newbs).