[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/index.ts

@@ -332,10 +332,6 @@ export class Config extends EventEmitter {
         return this.combinedData?.appLanguage;
     }
 
-    get skipOnboardingScreens() {
-        return this.combinedData?.skipOnboardingScreens ?? defaultPreferences.skipOnboardingScreens;
-    }
-
     // initialization/processing methods
 
     /**