♻️ 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/prismjs/components/prism-neon.min.js

@@ -1 +0,0 @@
-Prism.languages.neon={comment:{pattern:/#.*/,greedy:!0},datetime:{pattern:/(^|[[{(=:,\s])\d\d\d\d-\d\d?-\d\d?(?:(?:[Tt]| +)\d\d?:\d\d:\d\d(?:\.\d*)? *(?:Z|[-+]\d\d?(?::?\d\d)?)?)?(?=$|[\]}),\s])/,lookbehind:!0,alias:"number"},key:{pattern:/(^|[[{(,\s])[^,:=[\]{}()'"\s]+(?=\s*:(?:$|[\]}),\s])|\s*=)/,lookbehind:!0,alias:"property"},number:{pattern:/(^|[[{(=:,\s])[+-]?(?:0x[\da-fA-F]+|0o[0-7]+|0b[01]+|(?:\d+(?:\.\d*)?|\.?\d+)(?:[eE][+-]?\d+)?)(?=$|[\]}),:=\s])/,lookbehind:!0},boolean:{pattern:/(^|[[{(=:,\s])(?:false|no|true|yes)(?=$|[\]}),:=\s])/i,lookbehind:!0},null:{pattern:/(^|[[{(=:,\s])(?:null)(?=$|[\]}),:=\s])/i,lookbehind:!0,alias:"keyword"},string:{pattern:/(^|[[{(=:,\s])(?:('''|""")\r?\n(?:(?:[^\r\n]|\r?\n(?![\t ]*\2))*\r?\n)?[\t ]*\2|'[^'\r\n]*'|"(?:\\.|[^\\"\r\n])*")/,lookbehind:!0,greedy:!0},literal:{pattern:/(^|[[{(=:,\s])(?:[^#"',:=[\]{}()\s`-]|[:-][^"',=[\]{}()\s])(?:[^,:=\]})(\s]|:(?![\s,\]})]|$)|[ \t]+[^#,:=\]})(\s])*/,lookbehind:!0,alias:"string"},punctuation:/[,:=[\]{}()-]/};