Get rid of old beta mode

src/js/core/query_parameters.js

@@ -3,13 +3,8 @@ const options = queryString.parse(location.search);
 
 export let queryParamOptions = {
     embedProvider: null,
-    betaMode: null,
 };
 
 if (options.embed) {
     queryParamOptions.embedProvider = options.embed;
 }
-
-if (!G_IS_RELEASE && options.betamode) {
-    queryParamOptions.betaMode = true;
-}