[MM-46533] Remove buildConfig item and add webpack flags for onboarding screens and GPU acceleration (#2241)

* [MM-46533] Remove buildConfig item and add webpack flags for onboarding screens and GPU acceleration

* REVERT ME

* Use contexts instead

* Revert "REVERT ME"

This reverts commit 1e75779623f1c5eb2ce3a64e0c39cd4a8cf7ada7.

src/common/config/defaultPreferences.ts

@@ -43,7 +43,6 @@ const defaultPreferences: ConfigV3 = {
     lastActiveTeam: 0,
     downloadLocation: getDefaultDownloadLocation(),
     startInFullscreen: false,
-    skipOnboardingScreens: false,
 };
 
 export default defaultPreferences;