Fix Algolia creds documentation URL (forem#2766) [ci skip]

.gitpod.yml

@@ -17,7 +17,7 @@ tasks:
             [ -z "${ALGOLIASEARCH_API_KEY:=$(cat config/application.yml | grep ALGOLIASEARCH_API_KEY | sed 's/.*:\s*//')}" ] ; do
         gp open config/application.yml 2>/dev/null &&
         printf "\n❗ Dev.to requires free Algolia credentials.\n" &&
-        printf "❗ To get them, please follow https://docs.dev.to/get-api-keys-dev-env/#algolia\n\n" &&
+        printf "❗ To get them, please follow https://docs.dev.to/backend/algolia/#get-api-keys\n\n" &&
         read -p "Add them to config/application.yml, save the file, and press any key to continue... " -n 1 -r
       done ;
       bin/setup &&