global: remove functionality we deprecated for cgit v1.0

The man page states these were deprecated for v1.0. We are past v1.1,
so remove the functionality.

Signed-off-by: Christian Hesse <mail@eworm.de>
Reviewed-by: John Keeping <john@keeping.me.uk>

ui-repolist.c

@@ -288,9 +288,6 @@ void cgit_print_repolist(void)
 	cgit_print_docstart();
 	cgit_print_pageheader();
 
-	if (ctx.cfg.index_header)
-		html_include(ctx.cfg.index_header);
-
 	if (ctx.qry.sort)
 		sorted = sort_repolist(ctx.qry.sort);
 	else if (ctx.cfg.section_sort)