♻️ 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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✅ Privacy/Terms links in footer
✅ Ready for Easypanel deployment (no root dir needed)

Migration path:
- Old structure: /dealplustech-astro/
- New structure: / (root)

dealplustech-astro/node_modules/@shikijs/langs/dist/angular-template.mjs

@@ -1,8 +0,0 @@
-import angular_expression from './angular-expression.mjs'
-
-const lang = Object.freeze(JSON.parse("{\"injectTo\":[\"text.html.derivative\",\"text.html.derivative.ng\",\"source.ts.ng\"],\"injectionSelector\":\"L:text.html -comment\",\"name\":\"angular-template\",\"patterns\":[{\"include\":\"#interpolation\"}],\"repository\":{\"interpolation\":{\"begin\":\"\\\\{\\\\{\",\"beginCaptures\":{\"0\":{\"name\":\"punctuation.definition.block.ts\"}},\"contentName\":\"expression.ng\",\"end\":\"}}\",\"endCaptures\":{\"0\":{\"name\":\"punctuation.definition.block.ts\"}},\"patterns\":[{\"include\":\"expression.ng\"}]}},\"scopeName\":\"template.ng\",\"embeddedLangs\":[\"angular-expression\"]}"))
-
-export default [
-...angular_expression,
-lang
-]