♻️ 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

✅ 11 pages built successfully
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✅ Privacy/Terms links in footer
✅ Ready for Easypanel deployment (no root dir needed)

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

dealplustech-astro/node_modules/mdast-util-to-markdown/lib/configure.js

@@ -1,79 +0,0 @@
-/**
- * @import {Options, State} from './types.js'
- */
-
-const own = {}.hasOwnProperty
-
-/**
- * @param {State} base
- * @param {Options} extension
- * @returns {State}
- */
-export function configure(base, extension) {
-  let index = -1
-  /** @type {keyof Options} */
-  let key
-
-  // First do subextensions.
-  if (extension.extensions) {
-    while (++index < extension.extensions.length) {
-      configure(base, extension.extensions[index])
-    }
-  }
-
-  for (key in extension) {
-    if (own.call(extension, key)) {
-      switch (key) {
-        case 'extensions': {
-          // Empty.
-          break
-        }
-
-        /* c8 ignore next 4 */
-        case 'unsafe': {
-          list(base[key], extension[key])
-          break
-        }
-
-        case 'join': {
-          list(base[key], extension[key])
-          break
-        }
-
-        case 'handlers': {
-          map(base[key], extension[key])
-          break
-        }
-
-        default: {
-          // @ts-expect-error: matches.
-          base.options[key] = extension[key]
-        }
-      }
-    }
-  }
-
-  return base
-}
-
-/**
- * @template T
- * @param {Array<T>} left
- * @param {Array<T> | null | undefined} right
- */
-function list(left, right) {
-  if (right) {
-    left.push(...right)
-  }
-}
-
-/**
- * @template T
- * @param {Record<string, T>} left
- * @param {Record<string, T> | null | undefined} right
- */
-function map(left, right) {
-  if (right) {
-    Object.assign(left, right)
-  }
-}