♻️ 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/stringify-entities/lib/core.d.ts

@@ -1,26 +0,0 @@
-/**
- * Encode certain characters in `value`.
- *
- * @param {string} value
- * @param {CoreWithFormatOptions} options
- * @returns {string}
- */
-export function core(value: string, options: CoreWithFormatOptions): string;
-export type CoreOptions = {
-    /**
-     * Whether to only escape the given subset of characters.
-     */
-    subset?: ReadonlyArray<string>;
-    /**
-     * Whether to only escape possibly dangerous characters.
-     * Those characters are `"`, `&`, `'`, `<`, `>`, and `` ` ``.
-     */
-    escapeOnly?: boolean;
-};
-export type FormatOptions = {
-    /**
-     *  Format strategy.
-     */
-    format: (code: number, next: number, options: CoreWithFormatOptions) => string;
-};
-export type CoreWithFormatOptions = CoreOptions & FormatOptions & import('./util/format-smart.js').FormatSmartOptions;