feat: add CSS Bootstrap files

webapp/assets/css/webapp-tajine.css

+
+/* HTML list */
+.icon-list li::before {
+    display: block;
+    flex-shrink: 0;
+    width: 1.5em;
+    height: 1.5em;
+    margin-right: .5rem;
+    content: "";
+    background: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' fill='%23212529' viewBox='0 0 16 16'%3E%3Cpath d='M8 0a8 8 0 1 1 0 16A8 8 0 0 1 8 0zM4.5 7.5a.5.5 0 0 0 0 1h5.793l-2.147 2.146a.5.5 0 0 0 .708.708l3-3a.5.5 0 0 0 0-.708l-3-3a.5.5 0 1 0-.708.708L10.293 7.5H4.5z'/%3E%3C/svg%3E") no-repeat center center / 100% auto;
+}
+
+/* SVG icons  */
+.bi {
+    vertical-align: -.125em;
+    fill: currentColor;
+}
+
+/*
+input:valid {
+    border: 2px dashed green;
+}
+    input:valid:focus {
+        background-color: palegreen;
+    }
+input:invalid {
+    border: 2px dashed red;
+}
+*/
+
+