♻️ 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
✅ Cookie consent banner included
✅ 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-excel-formula.min.js

@@ -1 +0,0 @@
-Prism.languages["excel-formula"]={comment:{pattern:/(\bN\(\s*)"(?:[^"]|"")*"(?=\s*\))/i,lookbehind:!0,greedy:!0},string:{pattern:/"(?:[^"]|"")*"(?!")/,greedy:!0},reference:{pattern:/(?:'[^']*'|(?:[^\s()[\]{}<>*?"';,$&]*\[[^^\s()[\]{}<>*?"']+\])?\w+)!/,greedy:!0,alias:"string",inside:{operator:/!$/,punctuation:/'/,sheet:{pattern:/[^[\]]+$/,alias:"function"},file:{pattern:/\[[^[\]]+\]$/,inside:{punctuation:/[[\]]/}},path:/[\s\S]+/}},"function-name":{pattern:/\b[A-Z]\w*(?=\()/i,alias:"builtin"},range:{pattern:/\$?\b(?:[A-Z]+\$?\d+:\$?[A-Z]+\$?\d+|[A-Z]+:\$?[A-Z]+|\d+:\$?\d+)\b/i,alias:"selector",inside:{operator:/:/,cell:/\$?[A-Z]+\$?\d+/i,column:/\$?[A-Z]+/i,row:/\$?\d+/}},cell:{pattern:/\b[A-Z]+\d+\b|\$[A-Za-z]+\$?\d+\b|\b[A-Za-z]+\$\d+\b/,alias:"selector"},number:/(?:\b\d+(?:\.\d+)?|\B\.\d+)(?:e[+-]?\d+)?\b/i,boolean:/\b(?:FALSE|TRUE)\b/i,operator:/[-+*/^%=&,]|<[=>]?|>=?/,punctuation:/[[\]();{}|]/},Prism.languages.xlsx=Prism.languages.xls=Prism.languages["excel-formula"];