♻️ 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/mdast-util-to-markdown/lib/util/compile-pattern.js

@@ -1,24 +0,0 @@
-/**
- * @import {CompilePattern} from '../types.js'
- */
-
-/**
- * @type {CompilePattern}
- */
-export function compilePattern(pattern) {
-  if (!pattern._compiled) {
-    const before =
-      (pattern.atBreak ? '[\\r\\n][\\t ]*' : '') +
-      (pattern.before ? '(?:' + pattern.before + ')' : '')
-
-    pattern._compiled = new RegExp(
-      (before ? '(' + before + ')' : '') +
-        (/[|\\{}()[\]^$+*?.-]/.test(pattern.character) ? '\\' : '') +
-        pattern.character +
-        (pattern.after ? '(?:' + pattern.after + ')' : ''),
-      'g'
-    )
-  }
-
-  return pattern._compiled
-}