more useful settings in .env.example file

.env.example

@@ -54,5 +54,13 @@ MIX_APP_URL="${APP_URL}"
 MIX_API_BASE="${API_BASE}"
 MIX_API_SEARCH="${API_SEARCH}"
 
-ACTIVITY_PUB=false
+ACTIVITYPUB_INBOX=false
+ACTIVITYPUB_SHAREDINBOX=false
 
+# Set these both "true" to enable federation.
+# You might need to also run:
+#   php artisan cache:clear
+#   php artisan optimize:clear
+#   php artisan optimize
+ACTIVITY_PUB=false
+REMOTE_FOLLOW=false