♻️ 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

✅ 11 pages built successfully
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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-to-markdown/lib/util/indent-lines.js

@@ -1,35 +0,0 @@
-/**
- * @import {IndentLines} from '../types.js'
- */
-
-const eol = /\r?\n|\r/g
-
-/**
- * @type {IndentLines}
- */
-export function indentLines(value, map) {
-  /** @type {Array<string>} */
-  const result = []
-  let start = 0
-  let line = 0
-  /** @type {RegExpExecArray | null} */
-  let match
-
-  while ((match = eol.exec(value))) {
-    one(value.slice(start, match.index))
-    result.push(match[0])
-    start = match.index + match[0].length
-    line++
-  }
-
-  one(value.slice(start))
-
-  return result.join('')
-
-  /**
-   * @param {string} value
-   */
-  function one(value) {
-    result.push(map(value, line, !value))
-  }
-}