[MM-52969] Revert "MM-51482_Create Apps Category and link to bots DM (#22918)" (#23647)

* Revert "MM-51482_Create Apps Category and link to bots DM (#22918)"

This reverts commit 1051925eec.

* Revert "MM-51711_Feature flag: APPS sidebar category (#22766)"

This reverts commit 9156205178.

webapp/platform/types/src/config.ts

@@ -119,7 +119,6 @@ export type ClientConfig = {
     ExperimentalViewArchivedChannels: string;
     FileLevel: string;
     FeatureFlagAppsEnabled: string;
-    FeatureFlagAppsSidebarCategory: string;
     FeatureFlagBoardsProduct: string;
     FeatureFlagCallsEnabled: string;
     FeatureFlagGraphQL: string;