Rework the contact page

invenio_theme_tuw/theme/assets/semantic-ui/less/invenio_theme_tuw/theme/custom/contact.less

+/* -------------------- */
+/* contact page styling */
+/* -------------------- */
+
+.contact.container {
+  /* add margins to the contact blocks (including heading) */
+  section {
+    margin: 2em 0.5em;
+
+    /* indent the contact address blocks a bit (after the heading) */
+    .contact {
+      margin: 0 0.5em;
+    }
+  }
+
+  span {
+    /* include line breaks in the addresses */
+    display: block;
+
+    /* for the <pre> phone number */
+    pre {
+      display: inline;
+    }
+  }
+}