♻️ 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/nlcst-to-string/lib/index.js

@@ -1,38 +0,0 @@
-/**
- * @typedef {import('nlcst').Nodes} Nodes
- */
-
-/** @type {Readonly<Array<Nodes>>} */
-const emptyNodes = []
-
-/**
- * Get the text content of a node or list of nodes.
- *
- * Prefers the node’s plain-text fields, otherwise serializes its children, and
- * if the given value is an array, serialize the nodes in it.
- *
- * @param {Array<Nodes> | Nodes} value
- *   Node or list of nodes to serialize.
- * @returns {string}
- *   Result.
- */
-export function toString(value) {
-  let index = -1
-
-  if (!value || (!Array.isArray(value) && !value.type)) {
-    throw new Error('Expected node, not `' + value + '`')
-  }
-
-  if ('value' in value) return value.value
-
-  const children = (Array.isArray(value) ? value : value.children) || emptyNodes
-
-  /** @type {Array<string>} */
-  const values = []
-
-  while (++index < children.length) {
-    values[index] = toString(children[index])
-  }
-
-  return values.join('')
-}