Revert changes to I'm Feeling Lucky

They didn't work and my ideas to fix them were much slower than the
original.

Author: jyn514

src/web/releases.rs

@@ -535,7 +535,7 @@ pub fn search_handler(req: &mut Request) -> IronResult<Response> {
                      INNER JOIN releases
                          ON crates.latest_version_id = releases.id
                      WHERE github_stars >= 100 AND rustdoc_status = true
-                     OFFSET FLOOR(RANDOM() * SELECT COUNT(*) FROM crates) LIMIT 1",
+                     OFFSET FLOOR(RANDOM() * 280) LIMIT 1",
                         &[]
                     ),
                 );