♻️ 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/prismjs/components/prism-go-module.js

@@ -1,24 +0,0 @@
-// https://go.dev/ref/mod#go-mod-file-module
-
-Prism.languages['go-mod'] = Prism.languages['go-module'] = {
-	'comment': {
-		pattern: /\/\/.*/,
-		greedy: true
-	},
-	'version': {
-		pattern: /(^|[\s()[\],])v\d+\.\d+\.\d+(?:[+-][-+.\w]*)?(?![^\s()[\],])/,
-		lookbehind: true,
-		alias: 'number'
-	},
-	'go-version': {
-		pattern: /((?:^|\s)go\s+)\d+(?:\.\d+){1,2}/,
-		lookbehind: true,
-		alias: 'number'
-	},
-	'keyword': {
-		pattern: /^([ \t]*)(?:exclude|go|module|replace|require|retract)\b/m,
-		lookbehind: true
-	},
-	'operator': /=>/,
-	'punctuation': /[()[\],]/
-};