♻️ 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-brightscript.min.js

@@ -1 +0,0 @@
-Prism.languages.brightscript={comment:/(?:\brem|').*/i,"directive-statement":{pattern:/(^[\t ]*)#(?:const|else(?:[\t ]+if)?|end[\t ]+if|error|if).*/im,lookbehind:!0,alias:"property",inside:{"error-message":{pattern:/(^#error).+/,lookbehind:!0},directive:{pattern:/^#(?:const|else(?:[\t ]+if)?|end[\t ]+if|error|if)/,alias:"keyword"},expression:{pattern:/[\s\S]+/,inside:null}}},property:{pattern:/([\r\n{,][\t ]*)(?:(?!\d)\w+|"(?:[^"\r\n]|"")*"(?!"))(?=[ \t]*:)/,lookbehind:!0,greedy:!0},string:{pattern:/"(?:[^"\r\n]|"")*"(?!")/,greedy:!0},"class-name":{pattern:/(\bAs[\t ]+)\w+/i,lookbehind:!0},keyword:/\b(?:As|Dim|Each|Else|Elseif|End|Exit|For|Function|Goto|If|In|Print|Return|Step|Stop|Sub|Then|To|While)\b/i,boolean:/\b(?:false|true)\b/i,function:/\b(?!\d)\w+(?=[\t ]*\()/,number:/(?:\b\d+(?:\.\d+)?(?:[ed][+-]\d+)?|&h[a-f\d]+)\b[%&!#]?/i,operator:/--|\+\+|>>=?|<<=?|<>|[-+*/\\<>]=?|[:^=?]|\b(?:and|mod|not|or)\b/i,punctuation:/[.,;()[\]{}]/,constant:/\b(?:LINE_NUM)\b/i},Prism.languages.brightscript["directive-statement"].inside.expression.inside=Prism.languages.brightscript;