Adding redirect (#903)

Adding the redirect

Author: MichaelMacaulay

nginx.conf

@@ -150,6 +150,7 @@ http {
         rewrite ^/docs/([a-zA-Z][a-zA-Z])/studio/transferring-subgraph-ownership/$      $scheme://$http_host/docs/$1/subgraphs/developing/managing/transferring-a-subgraph/ permanent;
         rewrite ^/docs/([a-zA-Z][a-zA-Z])/subgraphs/$                                   $scheme://$http_host/docs/$1/subgraphs/developing/subgraphs/                        permanent;
         rewrite ^/docs/([a-zA-Z][a-zA-Z])/substreams/$                                  $scheme://$http_host/docs/$1/substreams/introduction/                               permanent;
+        rewrite ^/docs/([a-zA-Z][a-zA-Z])/substreams/sps/(.*)$                          $scheme://$http_host/docs/$1/sps/$2                                                 permanent;
         rewrite ^/docs/([a-zA-Z][a-zA-Z])/substreams/developing/sinks/sinks/$           $scheme://$http_host/docs/$1/substreams/developing/sinks/                           permanent;
         rewrite ^/docs/([a-zA-Z][a-zA-Z])/sunrise/$                                     $scheme://$http_host/docs/$1/archived/sunrise/                                      permanent;
         rewrite ^/docs/([a-zA-Z][a-zA-Z])/supported-network-requirements/$              $scheme://$http_host/docs/$1/indexing/supported-network-requirements/               permanent;