feat(config): add ahk exe override env vars

This commit introduces two new environment variables to override the exe
name that komorebi uses to verify that AutoHotKey is installed before
launching and reloading 'komorebi.ahk' configuration files.

resolve #147

README.md

@@ -155,6 +155,26 @@ the `AutoHotKey64.exe` executable for AutoHotKey v2 is in your `Path`. If both `
 exist in your home directory, only `komorebi.ahk` will be loaded. An example of an AutoHotKey v2 configuration file
 for _komorebi_ can be found [here](https://gist.github.com/crosstyan/dafacc0778dabf693ce9236c57b201cd).
 
+#### Using Different AHK Executables
+
+The preferred way to install AutoHotKey for use with `komorebi` is to install it via `scoop`:
+
+```powershell
+scoop install autohotkey
+```
+
+If you install AutoHotKey using a different method, the name of the executable file may differ from the name given by
+`scoop`, and thus what is expected by default in `komorebi`.
+
+You may override the executables that `komorebi` looks for to launch and reload `komorebi.ahk` configuration files using
+by setting one of the following two environment variables depending on which version of AutoHotKey you wish to use:
+
+- `$Env:KOMOREBI_AHK_V1_EXE`
+- `$Env:KOMOREBI_AHK_V2_EXE`
+
+Please keep in mind that even when setting a custom executable name using these environment variables, the executables
+are still required to be in your `Path`.
+
 ### Common First-Time Tips
 
 #### Generating Common Application-Specific Configurations