♻️ 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-find-and-replace/index.js

@@ -1,11 +0,0 @@
-/**
- * @typedef {import('./lib/index.js').FindAndReplaceList} FindAndReplaceList
- * @typedef {import('./lib/index.js').FindAndReplaceTuple} FindAndReplaceTuple
- * @typedef {import('./lib/index.js').Find} Find
- * @typedef {import('./lib/index.js').Options} Options
- * @typedef {import('./lib/index.js').RegExpMatchObject} RegExpMatchObject
- * @typedef {import('./lib/index.js').ReplaceFunction} ReplaceFunction
- * @typedef {import('./lib/index.js').Replace} Replace
- */
-
-export {findAndReplace} from './lib/index.js'