♻️ 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/text.js

@@ -1,38 +0,0 @@
-/**
- * @import {Parents, Text} from 'hast'
- * @import {Raw} from 'mdast-util-to-hast'
- * @import {State} from '../index.js'
- */
-
-import {stringifyEntities} from 'stringify-entities'
-
-// Declare array as variable so it can be cached by `stringifyEntities`
-const textEntitySubset = ['<', '&']
-
-/**
- * Serialize a text node.
- *
- * @param {Raw | Text} node
- *   Node to handle.
- * @param {number | undefined} _
- *   Index of `node` in `parent.
- * @param {Parents | undefined} parent
- *   Parent of `node`.
- * @param {State} state
- *   Info passed around about the current state.
- * @returns {string}
- *   Serialized node.
- */
-export function text(node, _, parent, state) {
-  // Check if content of `node` should be escaped.
-  return parent &&
-    parent.type === 'element' &&
-    (parent.tagName === 'script' || parent.tagName === 'style')
-    ? node.value
-    : stringifyEntities(
-        node.value,
-        Object.assign({}, state.settings.characterReferences, {
-          subset: textEntitySubset
-        })
-      )
-}