♻️ 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/micromark-extension-gfm-footnote/dev/lib/html.d.ts

@@ -1,25 +0,0 @@
-/**
- * Generate the default label that GitHub uses on backreferences.
- *
- * @param {number} referenceIndex
- *   Index of the definition in the order that they are first referenced,
- *   0-indexed.
- * @param {number} rereferenceIndex
- *   Index of calls to the same definition, 0-indexed.
- * @returns {string}
- *   Default label.
- */
-export function defaultBackLabel(referenceIndex: number, rereferenceIndex: number): string;
-/**
- * Create an extension for `micromark` to support GFM footnotes when
- * serializing to HTML.
- *
- * @param {Options | null | undefined} [options={}]
- *   Configuration (optional).
- * @returns {HtmlExtension}
- *   Extension for `micromark` that can be passed in `htmlExtensions` to
- *   support GFM footnotes when serializing to HTML.
- */
-export function gfmFootnoteHtml(options?: Options | null | undefined): HtmlExtension;
-import type { HtmlOptions as Options } from 'micromark-extension-gfm-footnote';
-import type { HtmlExtension } from 'micromark-util-types';