[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/main/app/intercom.ts

@@ -86,7 +86,10 @@ export function handleOpenTab(event: IpcMainEvent, serverName: string, tabName:
 }
 
 export function handleMainWindowIsShown() {
-    const showWelcomeScreen = !Config.skipOnboardingScreens && !Config.teams.length;
+    // eslint-disable-next-line no-undef
+    // eslint-disable-next-line @typescript-eslint/ban-ts-comment
+    // @ts-ignore
+    const showWelcomeScreen = !(Boolean(__SKIP_ONBOARDING_SCREENS__) || Config.teams.length);
     const mainWindow = WindowManager.getMainWindow();
 
     if (mainWindow) {