♻️ 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/astro/dist/content/data-store.js

@@ -1,75 +0,0 @@
-import * as devalue from "devalue";
-class ImmutableDataStore {
-  _collections = /* @__PURE__ */ new Map();
-  constructor() {
-    this._collections = /* @__PURE__ */ new Map();
-  }
-  get(collectionName, key) {
-    return this._collections.get(collectionName)?.get(String(key));
-  }
-  entries(collectionName) {
-    const collection = this._collections.get(collectionName) ?? /* @__PURE__ */ new Map();
-    return [...collection.entries()];
-  }
-  values(collectionName) {
-    const collection = this._collections.get(collectionName) ?? /* @__PURE__ */ new Map();
-    return [...collection.values()];
-  }
-  keys(collectionName) {
-    const collection = this._collections.get(collectionName) ?? /* @__PURE__ */ new Map();
-    return [...collection.keys()];
-  }
-  has(collectionName, key) {
-    const collection = this._collections.get(collectionName);
-    if (collection) {
-      return collection.has(String(key));
-    }
-    return false;
-  }
-  hasCollection(collectionName) {
-    return this._collections.has(collectionName);
-  }
-  collections() {
-    return this._collections;
-  }
-  /**
-   * Attempts to load a DataStore from the virtual module.
-   * This only works in Vite.
-   */
-  static async fromModule() {
-    try {
-      const data = await import("astro:data-layer-content");
-      if (data.default instanceof Map) {
-        return ImmutableDataStore.fromMap(data.default);
-      }
-      const map = devalue.unflatten(data.default);
-      return ImmutableDataStore.fromMap(map);
-    } catch {
-    }
-    return new ImmutableDataStore();
-  }
-  static async fromMap(data) {
-    const store = new ImmutableDataStore();
-    store._collections = data;
-    return store;
-  }
-}
-function dataStoreSingleton() {
-  let instance = void 0;
-  return {
-    get: async () => {
-      if (!instance) {
-        instance = ImmutableDataStore.fromModule();
-      }
-      return instance;
-    },
-    set: (store) => {
-      instance = store;
-    }
-  };
-}
-const globalDataStore = dataStoreSingleton();
-export {
-  ImmutableDataStore,
-  globalDataStore
-};