Update hugo setting for official site (#6231)

Signed-off-by: Yoshiki Fujikane <ffjlabo@gmail.com>

Author: ffjlabo

docs/config.toml

@@ -167,6 +167,10 @@ no = 'Sorry to hear that. Please <a href="https://github.com/pipe-cd/pipecd/issu
   githubbranch = "master"
   url = "/docs-dev/"
 
+[[params.versions]]
+  version = "v0.54.x"
+  url = "/docs-v0.54.x/"
+
 [[params.versions]]
   version = "v0.53.x"
   url = "/docs-v0.53.x/"

docs/main.go

@@ -28,7 +28,7 @@ import (
 const dir = "/public"
 
 // Don't update here manually. /hack/gen-release-docs.sh does.
-const latestPath = "/docs-v0.53.x/"
+const latestPath = "/docs-v0.54.x/"
 
 func main() {
 	var (