♻️ 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/mdast-util-phrasing/lib/index.d.ts

@@ -1,3 +0,0 @@
-export function phrasing(node?: unknown): node is import("mdast").Break | import("mdast").Delete | import("mdast").Emphasis | import("mdast").FootnoteReference | import("mdast").Image | import("mdast").ImageReference | import("mdast").InlineCode | import("mdast").Link | import("mdast").LinkReference | import("mdast").Strong | import("mdast").Text;
-export type Html = import('mdast').Html;
-export type PhrasingContent = import('mdast').PhrasingContent;

dealplustech-astro/node_modules/mdast-util-phrasing/lib/index.js

@@ -1,45 +0,0 @@
-/**
- * @typedef {import('mdast').Html} Html
- * @typedef {import('mdast').PhrasingContent} PhrasingContent
- */
-
-import {convert} from 'unist-util-is'
-
-/**
- * Check if the given value is *phrasing content*.
- *
- * > 👉 **Note**: Excludes `html`, which can be both phrasing or flow.
- *
- * @param node
- *   Thing to check, typically `Node`.
- * @returns
- *   Whether `value` is phrasing content.
- */
-
-export const phrasing =
-  /** @type {(node?: unknown) => node is Exclude<PhrasingContent, Html>} */
-  (
-    convert([
-      'break',
-      'delete',
-      'emphasis',
-      // To do: next major: removed since footnotes were added to GFM.
-      'footnote',
-      'footnoteReference',
-      'image',
-      'imageReference',
-      'inlineCode',
-      // Enabled by `mdast-util-math`:
-      'inlineMath',
-      'link',
-      'linkReference',
-      // Enabled by `mdast-util-mdx`:
-      'mdxJsxTextElement',
-      // Enabled by `mdast-util-mdx`:
-      'mdxTextExpression',
-      'strong',
-      'text',
-      // Enabled by `mdast-util-directive`:
-      'textDirective'
-    ])
-  )