pagure: increase crawl delay to reduce load

This was causing pagure to not be very responsive.
Lets try increasing the delay to reduce load.

Signed-off-by: Kevin Fenzi <kevin@scrye.com>

roles/pagure/templates/robots.txt.j2

@@ -6,5 +6,5 @@ Disallow: /api
 Disallow: /login
 Disallow: /*/raw
 Disallow: /*/blob
-Crawl-Delay: 2
+Crawl-Delay: 10
 {% endif %}