♻️ Restructure: Move Astro to repository root

BREAKING CHANGE: Astro project is now at repository root
- Removed dealplustech-astro subdirectory
- Moved all Astro files to root
- Updated PostCSS config to .cjs
- Removed old Next.js files

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✅ Ready for Easypanel deployment (no root dir needed)

Migration path:
- Old structure: /dealplustech-astro/
- New structure: / (root)

dealplustech-astro/node_modules/hast-util-to-html/lib/handle/comment.js

@@ -1,52 +0,0 @@
-/**
- * @import {Comment, Parents} from 'hast'
- * @import {State} from '../index.js'
- */
-
-import {stringifyEntities} from 'stringify-entities'
-
-const htmlCommentRegex = /^>|^->|<!--|-->|--!>|<!-$/g
-
-// Declare arrays as variables so it can be cached by `stringifyEntities`
-const bogusCommentEntitySubset = ['>']
-const commentEntitySubset = ['<', '>']
-
-/**
- * Serialize a comment.
- *
- * @param {Comment} node
- *   Node to handle.
- * @param {number | undefined} _1
- *   Index of `node` in `parent.
- * @param {Parents | undefined} _2
- *   Parent of `node`.
- * @param {State} state
- *   Info passed around about the current state.
- * @returns {string}
- *   Serialized node.
- */
-export function comment(node, _1, _2, state) {
-  // See: <https://html.spec.whatwg.org/multipage/syntax.html#comments>
-  return state.settings.bogusComments
-    ? '<?' +
-        stringifyEntities(
-          node.value,
-          Object.assign({}, state.settings.characterReferences, {
-            subset: bogusCommentEntitySubset
-          })
-        ) +
-        '>'
-    : '<!--' + node.value.replace(htmlCommentRegex, encode) + '-->'
-
-  /**
-   * @param {string} $0
-   */
-  function encode($0) {
-    return stringifyEntities(
-      $0,
-      Object.assign({}, state.settings.characterReferences, {
-        subset: commentEntitySubset
-      })
-    )
-  }
-}