♻️ 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/micromark-core-commonmark/lib/line-ending.js

@@ -1,33 +0,0 @@
-/**
- * @import {
- *   Construct,
- *   State,
- *   TokenizeContext,
- *   Tokenizer
- * } from 'micromark-util-types'
- */
-
-import { factorySpace } from 'micromark-factory-space';
-import { markdownLineEnding } from 'micromark-util-character';
-/** @type {Construct} */
-export const lineEnding = {
-  name: 'lineEnding',
-  tokenize: tokenizeLineEnding
-};
-
-/**
- * @this {TokenizeContext}
- *   Context.
- * @type {Tokenizer}
- */
-function tokenizeLineEnding(effects, ok) {
-  return start;
-
-  /** @type {State} */
-  function start(code) {
-    effects.enter("lineEnding");
-    effects.consume(code);
-    effects.exit("lineEnding");
-    return factorySpace(effects, ok, "linePrefix");
-  }
-}