docs: Added redirects for removed api clients pages (#1036)

Pages were removed in
apify/apify-client-python#232 and
apify/apify-client-js#542

nginx.conf

@@ -192,6 +192,15 @@ server {
   rewrite ^/academy/php/using-apify-scraper-with-php$ /academy/php/use-apify-from-php permanent;
   rewrite ^/api/client/?$ /api redirect;
 
+  # unified api clients docs pages -> getting started page
+  rewrite ^/api/client/python/docs/quick-start$ /api/client/python/docs permanent;
+  rewrite ^/api/client/python/docs/features$ /api/client/python/docs permanent;
+  rewrite ^/api/client/python/docs/usage-concepts$ /api/client/python/docs permanent;
+
+  rewrite ^/api/client/js/docs/quick-start$ /api/client/js/docs permanent;
+  rewrite ^/api/client/js/docs/features$ /api/client/js/docs permanent;
+  rewrite ^/api/client/js/docs/usage-concepts$ /api/client/js/docs permanent;
+
   # sdk/js/api -> sdk/js/reference
   rewrite ^/sdk/js/api/apify(.*)$ /sdk/js/reference$1 permanent;
   rewrite ^/sdk/js/api(.*)$ /sdk/js/reference$1 permanent;