Switch to bootstrap local

Author: ubaumann

static/bootstrap.min.css

@@ -7,7 +7,7 @@
     <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
 
     <!-- Bootstrap CSS -->
-    <link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.5.0/css/bootstrap.min.css"
+    <link rel="stylesheet" href="{{ url_for('static', filename='bootstrap.min.css') }}"
         integrity="sha384-9aIt2nRpC12Uk9gS9baDl411NQApFmC26EwAOH8WgZl5MYYxFfc+NcPb1dKGj7Sk" crossorigin="anonymous">
 
     <title>{{name}}101</title>