Wrap tabs when screen shrinks (#396)

Closes #390

Author: stefanv

assets/theme-css/tabs.css

@@ -6,6 +6,7 @@
 [role="tablist"] {
   display: flex;
   flex-flow: row wrap;
+  row-gap: 0.25rem;
   margin-bottom: 0px;
   padding-bottom: 0px;
 }
@@ -18,7 +19,6 @@
   margin-bottom: 0;
   color: var(--pst-color-text);
   font-weight: bold;
-  max-width: 22%;
   text-align: left;
   cursor: pointer;
   font-size: 1rem;