♻️ 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-gap.min.js

@@ -1 +0,0 @@
-Prism.languages.gap={shell:{pattern:/^gap>[\s\S]*?(?=^gap>|$(?![\s\S]))/m,greedy:!0,inside:{gap:{pattern:/^(gap>).+(?:(?:\r(?:\n|(?!\n))|\n)>.*)*/,lookbehind:!0,inside:null},punctuation:/^gap>/}},comment:{pattern:/#.*/,greedy:!0},string:{pattern:/(^|[^\\'"])(?:'(?:[^\r\n\\']|\\.){1,10}'|"(?:[^\r\n\\"]|\\.)*"(?!")|"""[\s\S]*?""")/,lookbehind:!0,greedy:!0,inside:{continuation:{pattern:/([\r\n])>/,lookbehind:!0,alias:"punctuation"}}},keyword:/\b(?:Assert|Info|IsBound|QUIT|TryNextMethod|Unbind|and|atomic|break|continue|do|elif|else|end|fi|for|function|if|in|local|mod|not|od|or|quit|readonly|readwrite|rec|repeat|return|then|until|while)\b/,boolean:/\b(?:false|true)\b/,function:/\b[a-z_]\w*(?=\s*\()/i,number:{pattern:/(^|[^\w.]|\.\.)(?:\d+(?:\.\d*)?|\.\d+)(?:[eE][+-]?\d+)?(?:_[a-z]?)?(?=$|[^\w.]|\.\.)/,lookbehind:!0},continuation:{pattern:/([\r\n])>/,lookbehind:!0,alias:"punctuation"},operator:/->|[-+*/^~=!]|<>|[<>]=?|:=|\.\./,punctuation:/[()[\]{},;.:]/},Prism.languages.gap.shell.inside.gap.inside=Prism.languages.gap;