feat(shortcuts): add helper written in egui

docs/whkdrc.sample

@@ -5,6 +5,8 @@
 alt + o                 : taskkill /f /im whkd.exe; Start-Process whkd -WindowStyle hidden # if shell is pwsh / powershell
 alt + shift + o         : komorebic reload-configuration
 
+alt + i                 : komorebic toggle-shortcuts
+
 # App shortcuts - these require shell to be pwsh / powershell
 # The apps will be focused if open, or launched if not open
 # alt + f                 : if ($wshell.AppActivate('Firefox') -eq $False) { start firefox }