Updated 404 page

updated error page

updated book.toml

Delete docs/book/src/404.md

Author: Kuzuri247

docs/book/book.toml

@@ -5,7 +5,7 @@ src = "src"
 title = "The Kubebuilder Book"
 
 [output.html]
-curly-quotes = true
+smart-punctuation = true
 additional-css = ["theme/css/markers.css", "theme/css/custom.css", "theme/css/version-dropdown.css"]
 git-repository-url = "https://github.com/kubernetes-sigs/kubebuilder"
 edit-url-template = "https://github.com/kubernetes-sigs/kubebuilder/edit/master/docs/book/{path}"

docs/book/src/404.md

@@ -1,8 +1,17 @@
-# TODO
-
-If you're seeing this page, it's probably because something's not done in
-the book yet, or you stumbled upon an old link.  Go [see if anyone else
-has found
-this](https://github.com/kubernetes-sigs/kubebuilder/issues?q=is%3Aopen+is%3Aissue+label%3Akind%2Fdocumentation)
-or [bug the
-maintainers](https://github.com/kubernetes-sigs/kubebuilder/issues/new?assignees=&labels=kind%2Fdocumentation).
+# Page Not Found
+
+The page you are looking for could not be found. This might be because:
+
+1. The page has been moved or renamed
+2. The page is no longer available
+3. The URL was entered incorrectly
+
+Please try:
+
+- Going back to the [home page](https://book.kubebuilder.io/)
+- Using the search function
+- Suggest an edit [documentation index](https://github.com/kubernetes-sigs/kubebuilder/tree/master/docs/book/src)
+
+Check out if someone is working on your issue [report an issue](https://github.com/kubernetes-sigs/kubebuilder/issues)
+If you believe this is an error, please [report an issue](https://github.com/kubernetes-sigs/kubebuilder/issues/new?template=BLANK_ISSUE)
+Reach out to us on [Slack](https://kubernetes.slack.com/messages/kubebuilder)