add remove_content into routes utils

backstage/utils/routes.py

@@ -0,0 +1,11 @@
+from flask import flash, request
+import requests
+
+
+def remove_content():
+    url = request.args.get('url', type=str)
+    response = requests.delete('http://127.0.0.1:5000/api/contents?url={}'.format(url))
+    if response.status_code == 200:
+        flash('刪除文章成功', 'success')
+    else:
+        flash('刪除文章失敗', 'danger')