Make links a little bolder

To make them more prominent, to compensate for the blue colour

themes/tiddlywiki/vanilla/base.tid

@@ -275,7 +275,7 @@ table tfoot tr td {
 button.tc-tiddlylink,
 a.tc-tiddlylink {
 	text-decoration: none;
-	font-weight: normal;
+	font-weight: 500;
 	color: <<colour tiddler-link-foreground>>;
 	-webkit-user-select: inherit; /* Otherwise the draggable attribute makes links impossible to select */
 }