♻️ 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-iecst.min.js

@@ -1 +0,0 @@
-Prism.languages.iecst={comment:[{pattern:/(^|[^\\])(?:\/\*[\s\S]*?(?:\*\/|$)|\(\*[\s\S]*?(?:\*\)|$)|\{[\s\S]*?(?:\}|$))/,lookbehind:!0,greedy:!0},{pattern:/(^|[^\\:])\/\/.*/,lookbehind:!0,greedy:!0}],string:{pattern:/(["'])(?:\\(?:\r\n|[\s\S])|(?!\1)[^\\\r\n])*\1/,greedy:!0},keyword:[/\b(?:END_)?(?:PROGRAM|CONFIGURATION|INTERFACE|FUNCTION_BLOCK|FUNCTION|ACTION|TRANSITION|TYPE|STRUCT|(?:INITIAL_)?STEP|NAMESPACE|LIBRARY|CHANNEL|FOLDER|RESOURCE|VAR_(?:ACCESS|CONFIG|EXTERNAL|GLOBAL|INPUT|IN_OUT|OUTPUT|TEMP)|VAR|METHOD|PROPERTY)\b/i,/\b(?:AT|BY|(?:END_)?(?:CASE|FOR|IF|REPEAT|WHILE)|CONSTANT|CONTINUE|DO|ELSE|ELSIF|EXIT|EXTENDS|FROM|GET|GOTO|IMPLEMENTS|JMP|NON_RETAIN|OF|PRIVATE|PROTECTED|PUBLIC|RETAIN|RETURN|SET|TASK|THEN|TO|UNTIL|USING|WITH|__CATCH|__ENDTRY|__FINALLY|__TRY)\b/],"class-name":/\b(?:ANY|ARRAY|BOOL|BYTE|U?(?:D|L|S)?INT|(?:D|L)?WORD|DATE(?:_AND_TIME)?|DT|L?REAL|POINTER|STRING|TIME(?:_OF_DAY)?|TOD)\b/,address:{pattern:/%[IQM][XBWDL][\d.]*|%[IQ][\d.]*/,alias:"symbol"},number:/\b(?:16#[\da-f]+|2#[01_]+|0x[\da-f]+)\b|\b(?:D|DT|T|TOD)#[\d_shmd:]*|\b[A-Z]*#[\d.,_]*|(?:\b\d+(?:\.\d*)?|\B\.\d+)(?:e[+-]?\d+)?/i,boolean:/\b(?:FALSE|NULL|TRUE)\b/,operator:/S?R?:?=>?|&&?|\*\*?|<[=>]?|>=?|[-:^/+#]|\b(?:AND|EQ|EXPT|GE|GT|LE|LT|MOD|NE|NOT|OR|XOR)\b/,function:/\b[a-z_]\w*(?=\s*\()/i,punctuation:/[()[\].,;]/};