[HDDS-7685][website] Custom 404 Page (#42)

Co-authored-by: Yi-Sheng Lien <[email protected]>

config.toml

@@ -21,3 +21,8 @@ baseUrl = "/"
 # Configure the English version of the website.
 [languages.en]
   languageCode = "en-us"
+
+[[redirects]]
+  from = "/*"
+  to = "/404/"
+  status = 404

layouts/404.html

@@ -0,0 +1,19 @@
+<!--
+ Licensed under the Apache License, Version 2.0 (the "License");
+ you may not use this file except in compliance with the License.
+ You may obtain a copy of the License at
+
+   http://www.apache.org/licenses/LICENSE-2.0
+
+ Unless required by applicable law or agreed to in writing, software
+ distributed under the License is distributed on an "AS IS" BASIS,
+ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ See the License for the specific language governing permissions and
+ limitations under the License. See accompanying LICENSE file.
+-->
+{{ partial "header.html" . }}
+<div class="container">
+    <p>Page not found</p>
+    <p><a href="/">Go to Home Page</a></p>
+</div>
+{{ partial "footer.html" . }}