ui: pin bootstrap css version
<meta charset="utf-8"/>
<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no"/>
<meta http-equiv="content-type" content="text/html; charset=UTF-8"/>
- <link type="text/css" rel="stylesheet" href="https://unpkg.com/bootstrap/dist/css/bootstrap.min.css"/>
+ <link type="text/css" rel="stylesheet" href="https://unpkg.com/bootstrap@4.4.1/dist/css/bootstrap.min.css"/>
<link type="text/css" rel="stylesheet" href="https://unpkg.com/bootstrap-vue@2.11.0/dist/bootstrap-vue.min.css"/>
<link type="text/css" rel="stylesheet" href="assets/themify-icons.css"/>
<script src="https://polyfill.io/v3/polyfill.min.js?version=3.52.1&features=es2015%2CIntersectionObserver"></script>
