adding redirect for file name change

Author: jason-cf

public/_redirects

@@ -1564,6 +1564,7 @@
 /workers-ai/configuration/workers-ai-sdk/ /workers-ai/configuration/bindings/ 301
 /workers-ai/tutorials/creating-a-recommendation-api/ /developer-spotlight/tutorials/creating-a-recommendation-api/ 301
 /workers/observability/baselime-integration/ /workers/observability/integrations/baselime-integration/ 301
+/workers-ai/tutorials/image-generator-flux/ /workers-ai/tutorials/image-generation-playground/ 301
 
 # workers KV
 /kv/platform/environments/ /kv/reference/environments/ 301