Use 404 plugin

Author: npentrel

netlify.toml

@@ -47,4 +47,20 @@
 	providers = [
 		"google",
 		"yandex"
-	]
+	]
+
+[[plugins]]
+  # https://github.com/netlify-labs/netlify-plugin-a11y#readme
+  package = "@eggnstone/netlify-plugin-no-more-404"
+
+  # all inputs are optional, we just show you the defaults below
+  [plugins.inputs]
+
+  # either "warn" or "error"
+  on404 = "error"
+
+  # change this key to a new one any time you need to restart from scratch
+  cacheKey = "Jan202025"
+
+  # (for development) turn true for extra diagnostic logging
+  debugMode = true