Don't break certain table columns

For instance, if the "timestamp" column becomes too small, then every
timestamp is spread out across two lines, doubling the size of the
table.

src/root/static/css/hydra.css

@@ -87,3 +87,7 @@ div.page-header h1 small {
 div.news-item:not(:first-child) {
     margin-top: 1em;
 }
+
+td.nowrap {
+    white-space: nowrap;
+}