refactor: Move Astro to root, use PORT env (default 80), allow all hosts

- Move Astro files from dealplustech-astro/ to project root
- Update Dockerfile: PORT environment variable (default 80)
- Add vite.config.ts with allowedHosts: true
- Matches nixpacks behavior for Easypanel deployment
- No hardcoded ports or domains

node_modules/micromark-extension-gfm-task-list-item/lib/html.js

@@ -0,0 +1,29 @@
+/**
+ * @import {HtmlExtension} from 'micromark-util-types'
+ */
+
+/**
+ * Create an HTML extension for `micromark` to support GFM task list items when
+ * serializing to HTML.
+ *
+ * @returns {HtmlExtension}
+ *   Extension for `micromark` that can be passed in `htmlExtensions` to
+ *   support GFM task list items when serializing to HTML.
+ */
+export function gfmTaskListItemHtml() {
+  return {
+    enter: {
+      taskListCheck() {
+        this.tag('<input type="checkbox" disabled="" ');
+      }
+    },
+    exit: {
+      taskListCheck() {
+        this.tag('/>');
+      },
+      taskListCheckValueChecked() {
+        this.tag('checked="" ');
+      }
+    }
+  };
+}