Let hugo build the 404 page directly (#862)

netlify.toml

@@ -11,8 +11,6 @@
 [build.environment]
   # extra environment variables if needed.
 
-# we need to manually copy the 404 page over for now, in every environment
-# cf https://github.com/shift-org/shift-docs/issues/862
 [context.deploy-preview]
   # -D builds draft content for deploy previews
   # ( the doubledash is needed to pass the argument through to hugo )

package.json

@@ -31,8 +31,7 @@
     "deploy": "concurrently --max-processes 1 -P 'npm:deploy:hugo -- {@}' 'npm:deploy:vite' --",
     "deploy:hugo": "exec-bin bin/hugo/hugo -s site",
     "deploy:vite": "npm -w cal run deploy",
-    "postdeploy": "cp site/public/404/index.html site/public/404.html",
-
+
     "postinstall": "hugo-installer --version 0.152.2",
     "test": "npm -w app test --",
 

site/content/404.md

@@ -1,14 +1,21 @@
 ---
 title: 'Page not found'
 weight: '1'
+# netlify serves this file for any unmatched url, so it has to
+# land at /404.html rather than hugo's default /404/index.html.
+# ( _default/list.html redirects there too. )
+url: '/404.html'
+# ... and a "page not found" page has no business in the sitemap.
+sitemap:
+  disable: true
 ---
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