Add guide for CDN, menu reorg

doc/guides/csslayer/NormalizeDoc.vue

@@ -1,23 +0,0 @@
-<template>
-    <DocSectionText v-bind="$attrs">
-        <p>Normalize is another utility to reset CSS of the standard elements. While importing the CSS file, assign it to a layer and define the layer order with primevue coming after the normalized layer.</p>
-        <DocSectionCode :code="code" hideToggleCode hideCodeSandbox hideStackBlitz />
-    </DocSectionText>
-</template>
-
-<script>
-export default {
-    data() {
-        return {
-            checked: false,
-            code: {
-                basic: `
-@layer normalize, primevue;
-
-@import "normalize.css" layer(normalize-reset);
-`
-            }
-        };
-    }
-};
-</script>