♻️ 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-squirrel.min.js

@@ -1 +0,0 @@
-Prism.languages.squirrel=Prism.languages.extend("clike",{comment:[Prism.languages.clike.comment[0],{pattern:/(^|[^\\:])(?:\/\/|#).*/,lookbehind:!0,greedy:!0}],string:{pattern:/(^|[^\\"'@])(?:@"(?:[^"]|"")*"(?!")|"(?:[^\\\r\n"]|\\.)*")/,lookbehind:!0,greedy:!0},"class-name":{pattern:/(\b(?:class|enum|extends|instanceof)\s+)\w+(?:\.\w+)*/,lookbehind:!0,inside:{punctuation:/\./}},keyword:/\b(?:__FILE__|__LINE__|base|break|case|catch|class|clone|const|constructor|continue|default|delete|else|enum|extends|for|foreach|function|if|in|instanceof|local|null|resume|return|static|switch|this|throw|try|typeof|while|yield)\b/,number:/\b(?:0x[0-9a-fA-F]+|\d+(?:\.(?:\d+|[eE][+-]?\d+))?)\b/,operator:/\+\+|--|<=>|<[-<]|>>>?|&&?|\|\|?|[-+*/%!=<>]=?|[~^]|::?/,punctuation:/[(){}\[\],;.]/}),Prism.languages.insertBefore("squirrel","string",{char:{pattern:/(^|[^\\"'])'(?:[^\\']|\\(?:[xuU][0-9a-fA-F]{0,8}|[\s\S]))'/,lookbehind:!0,greedy:!0}}),Prism.languages.insertBefore("squirrel","operator",{"attribute-punctuation":{pattern:/<\/|\/>/,alias:"important"},lambda:{pattern:/@(?=\()/,alias:"operator"}});