♻️ 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/mdast-util-gfm-footnote/index.d.ts

@@ -1,34 +0,0 @@
-export {gfmFootnoteFromMarkdown, gfmFootnoteToMarkdown} from './lib/index.js'
-
-export interface ToMarkdownOptions {
-  // To do: next major: change default.
-  /**
-   * Use a blank line for the first line of footnote definitions
-   * (`boolean`, default: `false`).
-   */
-  firstLineBlank?: boolean | null | undefined
-}
-
-declare module 'mdast-util-to-markdown' {
-  interface ConstructNameMap {
-    /**
-     * Footnote definition.
-     *
-     * ```markdown
-     * > | [^a]: B.
-     *     ^^^^^^^^
-     * ```
-     */
-    footnoteDefinition: 'footnoteDefinition'
-
-    /**
-     * Footnote reference.
-     *
-     * ```markdown
-     * > | A[^b].
-     *      ^^^^
-     * ```
-     */
-    footnoteReference: 'footnoteReference'
-  }
-}