♻️ 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
✅ Cookie consent banner included
✅ 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-hast/index.d.ts

@@ -1,94 +0,0 @@
-import type {Data, ElementContent, Literal, Properties} from 'hast'
-
-// Expose types.
-export type {
-  FootnoteBackContentTemplate,
-  FootnoteBackLabelTemplate
-} from './lib/footer.js'
-export type {Handler, Handlers, Options, State} from './lib/state.js'
-
-// Expose JS API.
-export {handlers as defaultHandlers} from './lib/handlers/index.js'
-export {
-  defaultFootnoteBackContent,
-  defaultFootnoteBackLabel
-} from './lib/footer.js'
-export {toHast} from './lib/index.js'
-
-/**
- * Raw string of HTML embedded into HTML AST.
- */
-export interface Raw extends Literal {
-  /**
-   * Node type of raw.
-   */
-  type: 'raw'
-
-  /**
-   * Data associated with the hast raw.
-   */
-  data?: RawData | undefined
-}
-
-/**
- * Info associated with hast raw nodes by the ecosystem.
- */
-export interface RawData extends Data {}
-
-// Register nodes in content.
-declare module 'hast' {
-  interface ElementData {
-    /**
-     * Custom info relating to the node, if `<code>` in `<pre>`.
-     *
-     * Defined by `mdast-util-to-hast` (`remark-rehype`).
-     */
-    meta?: string | null | undefined
-  }
-
-  interface ElementContentMap {
-    /**
-     * Raw string of HTML embedded into HTML AST.
-     */
-    raw: Raw
-  }
-
-  interface RootContentMap {
-    /**
-     * Raw string of HTML embedded into HTML AST.
-     */
-    raw: Raw
-  }
-}
-
-// Register data on mdast.
-declare module 'mdast' {
-  interface Data {
-    /**
-     * Field supported by `mdast-util-to-hast` to signal that a node should
-     * result in something with these children.
-     *
-     * When this is defined, when a parent is created, these children will
-     * be used.
-     */
-    hChildren?: ElementContent[] | undefined
-
-    /**
-     * Field supported by `mdast-util-to-hast` to signal that a node should
-     * result in a particular element, instead of its default behavior.
-     *
-     * When this is defined, an element with the given tag name is created.
-     * For example, when setting `hName` to `'b'`, a `<b>` element is created.
-     */
-    hName?: string | undefined
-
-    /**
-     * Field supported by `mdast-util-to-hast` to signal that a node should
-     * result in an element with these properties.
-     *
-     * When this is defined, when an element is created, these properties will
-     * be used.
-     */
-    hProperties?: Properties | undefined
-  }
-}