Revert "Support new commentsEnabled property"

This reverts commit 5e7da6678d.

There are better standards in progress like a `capabilities` object:
https://litepub.social/litepub/lice.html

posts.go

@@ -1023,10 +1023,7 @@ func fetchPost(app *app, w http.ResponseWriter, r *http.Request) error {
 
 		p.Collection = &CollectionObj{Collection: *coll}
 		po := p.ActivityObject()
-		po.Context = []interface{}{
-			activitystreams.Namespace,
-			activitystreams.Extensions,
-		}
+		po.Context = []interface{}{activitystreams.Namespace}
 		return impart.RenderActivityJSON(w, po, http.StatusOK)
 	}
 
@@ -1096,9 +1093,6 @@ func (p *PublicPost) ActivityObject() *activitystreams.Object {
 			})
 		}
 	}
-
-	o.CommentsEnabled = false
-
 	return o
 }
 
@@ -1308,10 +1302,7 @@ func viewCollectionPost(app *app, w http.ResponseWriter, r *http.Request) error
 	} else if strings.Contains(r.Header.Get("Accept"), "application/activity+json") {
 		p.extractData()
 		ap := p.ActivityObject()
-		ap.Context = []interface{}{
-			activitystreams.Namespace,
-			activitystreams.Extensions,
-		}
+		ap.Context = []interface{}{activitystreams.Namespace}
 		return impart.RenderActivityJSON(w, ap, http.StatusOK)
 	} else {
 		p.extractData()