Add a pager on the repolist

This enables a pager on the repolist which restricts the number of entries
displayed per page, controlled by the new option `max-repo-count` (default
value 50).

Signed-off-by: Lars Hjemli <hjemli@gmail.com>
diff --git a/cgit.css b/cgit.css
index 30cb8e6..d57722c 100644
--- a/cgit.css
+++ b/cgit.css
@@ -413,6 +413,16 @@
 	padding-left: 1.5em;
 }
 
+div.pager {
+	text-align: center;
+	margin: 1em 0em 0em 0em;
+}
+
+div.pager a {
+	color: #777;
+	margin: 0em 0.5em;
+}
+
 span.age-mins {
 	font-weight: bold;
 	color: #080;