fix(docs): Standardize all internal links

docs/docs/behaviors/key-press.md

@@ -10,14 +10,14 @@ a certain key.
 
 The categories of supported codes are:
 
-- [Keyboard & Keypad](../codes/keyboard-keypad)
-- [Editing](../codes/editing)
-- [Media](../codes/media)
-- [Applications](../codes/applications)
-- [Input Assist](../codes/input-assist)
-- [Power](../codes/power)
+- [Keyboard & Keypad](../codes/keyboard-keypad.mdx)
+- [Editing](../codes/editing.mdx)
+- [Media](../codes/media.mdx)
+- [Applications](../codes/applications.mdx)
+- [Input Assist](../codes/input-assist.mdx)
+- [Power](../codes/power.mdx)
 
-Please visit the [codes](../codes) section for a comprehensive list.
+Please visit the [codes](../codes/index.mdx) section for a comprehensive list.
 
 For advanced users, user-defined HID usages are also supported but must be encoded, please see [`dt-bindings/zmk/keys.h`](https://github.com/zmkfirmware/zmk/blob/main/app/include/dt-bindings/zmk/keys.h) for further insight.
 
@@ -36,7 +36,7 @@ Doing so makes a set of defines such as `A`, `N1`, etc. available for use with t
 ### Improperly defined keymap - `dtlib.DTError: <board>.dts.pre.tmp:<line number>`
 
 When compiling firmware from a keymap, it may be common to encounter an error in the form of a`dtlib.DTError: <board>.dts.pre.tmp:<line number>`.
-For instructions to resolve such an error, click [here](../troubleshooting###Improperly-defined-keymap)
+For instructions to resolve such an error, click [here](../troubleshooting.md###Improperly-defined-keymap)
 
 ## Key Press