Remove 3rd CDN/Cloud Library

Problem/Motivation

USE CDN library make ad_theme so slow to open website,need about 30s-45s.

Steps to reproduce

In my country to connect fontsome/Cloudc... library is slowly.
In general that Js files need about 30-90s to get in chrome.

Proposed resolution

In extensions UI,Please give a switch to open/close CDN.Or remove it directly.