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

dealplustech-astro/node_modules/stringify-entities/lib/util/format-smart.d.ts

@@ -1,32 +0,0 @@
-/**
- * Configurable ways to encode a character yielding pretty or small results.
- *
- * @param {number} code
- * @param {number} next
- * @param {FormatSmartOptions} options
- * @returns {string}
- */
-export function formatSmart(code: number, next: number, options: FormatSmartOptions): string;
-export type FormatSmartOptions = {
-    /**
-     * Prefer named character references (`&`) where possible.
-     */
-    useNamedReferences?: boolean;
-    /**
-     * Prefer the shortest possible reference, if that results in less bytes.
-     * **Note**: `useNamedReferences` can be omitted when using `useShortestReferences`.
-     */
-    useShortestReferences?: boolean;
-    /**
-     * Whether to omit semicolons when possible.
-     * **Note**: This creates what HTML calls “parse errors” but is otherwise still valid HTML — don’t use this except when building a minifier.
-     * Omitting semicolons is possible for certain named and numeric references in some cases.
-     */
-    omitOptionalSemicolons?: boolean;
-    /**
-     * Create character references which don’t fail in attributes.
-     * **Note**: `attribute` only applies when operating dangerously with
-     * `omitOptionalSemicolons: true`.
-     */
-    attribute?: boolean;
-};