Remove the unused old header code (#2162)

* Remove the "blank" layout

* Remove conditional useMeta

* Remove conditional code from index.vue

* Remove conditional code from search.vue

* Remove conditional code from content-layout.vue

* Remove conditional code from middleware.ts

* Remove conditional code from stores

* Remove conditional code from pages

* Remove conditional code from composables

* Remove conditional code from components

* Remove -old components

* Remove -old tests

* Remove -old tests

* Remove -old tests

* Use useMeta on 404 page

src/components/VAudioTrack/layouts/VFullLayout.vue

@@ -1,13 +1,6 @@
 <template>
-  <div class="full-track w-full" :class="{ isNewHeaderEnabled }">
-    <div
-      class="relative"
-      :class="
-        isNewHeaderEnabled
-          ? 'border-b border-dark-charcoal-20'
-          : 'bg-dark-charcoal-06'
-      "
-    >
+  <div class="full-track w-full">
+    <div class="relative border-b border-dark-charcoal-20">
       <span
         v-if="currentTime > 0"
         class="pointer-events-none absolute left-0 hidden h-full w-4 bg-yellow md:block lg:w-10"
@@ -83,7 +76,6 @@ import { computed, defineComponent, PropType } from "@nuxtjs/composition-api"
 import type { AudioDetail } from "~/types/media"
 import { timeFmt } from "~/utils/time-fmt"
 import { AudioSize, AudioStatus, audioFeatures } from "~/constants/audio"
-import { useFeatureFlagStore } from "~/stores/feature-flag"
 
 import VButton from "~/components/VButton.vue"
 import VIcon from "~/components/VIcon/VIcon.vue"
@@ -113,18 +105,12 @@ export default defineComponent({
   setup(props) {
     const isSmall = computed(() => props.size === "s")
 
-    const featureFlagStore = useFeatureFlagStore()
-    const isNewHeaderEnabled = computed(() =>
-      featureFlagStore.isOn("new_header")
-    )
-
     return {
       timeFmt,
 
       isSmall,
       audioFeatures,
       externalIcon,
-      isNewHeaderEnabled,
     }
   },
 })
@@ -133,9 +119,6 @@ export default defineComponent({
 <style>
 .full-track .waveform {
   @apply h-[185px] rounded-sm;
-}
-
-.full-track.isNewHeaderEnabled .waveform {
   --waveform-background-color: theme("colors.white");
 }