Remove custom error page

I find the custom error page out of scope of this PR so I will create
another tracking PR to get this feature merged as soon as possible.

See: https://github.com/Human-Connection/Nitro-Web/pull/216

cypress/integration/moderation/HidePosts.feature

@@ -22,5 +22,5 @@ Feature: Hide Posts
     Given I am logged in with a "user" role
     Then the page "/post/this-post-is-disabled" returns a 404 error with a message:
     """
-    Sorry, the page you're looking for cannot be found.
+    This post could not be found
     """

layouts/error.vue

@@ -1,57 +0,0 @@
-<template>
-  <div class="layout-blank">
-    <ds-container>
-      <div class="error">
-        <h1>
-          {{ header }}
-        </h1>
-        <h3>
-          {{ subHeader }}
-        </h3>
-        <p>
-          {{ message }}
-        </p>
-      </div>
-    </ds-container>
-    <div id="overlay" />
-  </div>
-</template>
-
-<script>
-import seo from '~/components/mixins/seo'
-
-export default {
-  mixins: [seo],
-  props: {
-    error: {
-      type: Object,
-      default: () => {}
-    }
-  },
-  computed: {
-    statusCode() {
-      const mapping = {
-        '500': '500',
-        '404': '404'
-      }
-      return mapping[this.error.statusCode] || '500'
-    },
-    header() {
-      return this.$t(`error.header.${this.statusCode}`)
-    },
-    subHeader() {
-      return this.$t(`error.subHeader.${this.statusCode}`)
-    },
-    message() {
-      return this.$t(`error.message.${this.statusCode}`)
-    },
-    suggestion() {
-      console.log(this.$t(`error.suggestion.${this.statusCode}`))
-      return this.$t(`error.suggestion.${this.statusCode}`)
-    }
-  },
-  mounted() {
-    console.log(this.error)
-  }
-}
-</script>

pages/post/_slug/index.vue

@@ -236,7 +236,9 @@ export default {
       data: { Post }
     } = await client.query({ query, variables })
     if (Post.length <= 0) {
-      return error({ statusCode: 404 })
+      // TODO: custom 404 error page with translations
+      const message = 'This post could not be found'
+      return error({ statusCode: 404, message })
     }
     const [post] = Post
     return {