Moved frontend of REST Mock to frontend container (solves #168)

Co-authored-by: Adam Bem <adam.bem@zoho.eu>
Reviewed-on: #186
Reviewed-by: Mikolaj Widla <widlam@noreply.example.com>

Frontend/assets/scripts/frame.js

@@ -42,7 +42,7 @@ function init() {
     tools.set("xslt", "tools/xslt.html");
     tools.set("xmlform", "tools/xmlFormatter.html");
     tools.set("jsonform", "tools/jsonFormatter.html");
-    tools.set("mock", getMockHost());
+    tools.set("mock", "tools/mock.html");
 
     changeActiveTools('XML');
     loadLastPage();