Add redirects for development pages on Docs

salt/salt/nginx/tildes-static-sites.conf.jinja2

@@ -23,6 +23,14 @@ server {
         return 302 https://docs.tildes.net/policies/code-of-conduct;
     }
 
+    location /development {
+        return 302 https://docs.tildes.net/instructions/development;
+    }
+
+    location /development-setup {
+        return 302 https://docs.tildes.net/instructions/development-setup;
+    }
+
     location /mechanics {
         return 302 https://docs.tildes.net/instructions;
     }