♻️ 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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✅ Ready for Easypanel deployment (no root dir needed)

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

dealplustech-astro/node_modules/github-slugger/index.d.ts

@@ -1,43 +0,0 @@
-/**
- * Generate a slug.
- *
- * Does not track previously generated slugs: repeated calls with the same value
- * will result in the exact same slug.
- * Use the `GithubSlugger` class to get unique slugs.
- *
- * @param  {string} value
- *   String of text to slugify
- * @param  {boolean} [maintainCase=false]
- *   Keep the current case, otherwise make all lowercase
- * @return {string}
- *   A unique slug string
- */
-export function slug(value: string, maintainCase?: boolean | undefined): string;
-/**
- * Slugger.
- */
-export default class BananaSlug {
-    /** @type {Record<string, number>} */
-    occurrences: Record<string, number>;
-    /**
-     * Generate a unique slug.
-    *
-    * Tracks previously generated slugs: repeated calls with the same value
-    * will result in different slugs.
-    * Use the `slug` function to get same slugs.
-     *
-     * @param  {string} value
-     *   String of text to slugify
-     * @param  {boolean} [maintainCase=false]
-     *   Keep the current case, otherwise make all lowercase
-     * @return {string}
-     *   A unique slug string
-     */
-    slug(value: string, maintainCase?: boolean | undefined): string;
-    /**
-     * Reset - Forget all previous slugs
-     *
-     * @return void
-     */
-    reset(): void;
-}