♻️ 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-nim.min.js

@@ -1 +0,0 @@
-Prism.languages.nim={comment:{pattern:/#.*/,greedy:!0},string:{pattern:/(?:\b(?!\d)(?:\w|\\x[89a-fA-F][0-9a-fA-F])+)?(?:"""[\s\S]*?"""(?!")|"(?:\\[\s\S]|""|[^"\\])*")/,greedy:!0},char:{pattern:/'(?:\\(?:\d+|x[\da-fA-F]{0,2}|.)|[^'])'/,greedy:!0},function:{pattern:/(?:(?!\d)(?:\w|\\x[89a-fA-F][0-9a-fA-F])+|`[^`\r\n]+`)\*?(?:\[[^\]]+\])?(?=\s*\()/,greedy:!0,inside:{operator:/\*$/}},identifier:{pattern:/`[^`\r\n]+`/,greedy:!0,inside:{punctuation:/`/}},number:/\b(?:0[xXoObB][\da-fA-F_]+|\d[\d_]*(?:(?!\.\.)\.[\d_]*)?(?:[eE][+-]?\d[\d_]*)?)(?:'?[iuf]\d*)?/,keyword:/\b(?:addr|as|asm|atomic|bind|block|break|case|cast|concept|const|continue|converter|defer|discard|distinct|do|elif|else|end|enum|except|export|finally|for|from|func|generic|if|import|include|interface|iterator|let|macro|method|mixin|nil|object|out|proc|ptr|raise|ref|return|static|template|try|tuple|type|using|var|when|while|with|without|yield)\b/,operator:{pattern:/(^|[({\[](?=\.\.)|(?![({\[]\.).)(?:(?:[=+\-*\/<>@$~&%|!?^:\\]|\.\.|\.(?![)}\]]))+|\b(?:and|div|in|is|isnot|mod|not|notin|of|or|shl|shr|xor)\b)/m,lookbehind:!0},punctuation:/[({\[]\.|\.[)}\]]|[`(){}\[\],:]/};