Prepare for 'about site' page / add 'root-readme' option to cgitrc

The new option names a file which will be included on a new page, next
to the current 'index' page.

Signed-off-by: Lars Hjemli <hjemli@gmail.com>
diff --git a/ui-repolist.h b/ui-repolist.h
index c23e5d2..5b1e542 100644
--- a/ui-repolist.h
+++ b/ui-repolist.h
@@ -2,5 +2,6 @@
 #define UI_REPOLIST_H
 
 extern void cgit_print_repolist();
+extern void cgit_print_site_readme();
 
 #endif /* UI_REPOLIST_H */