fix: Fix product page syntax errors

1. Remove duplicate/broken code in product tables section
2. Fix PostCSS config for Tailwind 4
3. Add @tailwindcss/postcss dependency
4. Remove --production flag from Dockerfile (sharp required)

All fixes enable successful Docker build with favicon working.

node_modules/@shikijs/langs/dist/markdown-nix.mjs

@@ -0,0 +1,5 @@
+const lang = Object.freeze(JSON.parse("{\"fileTypes\":[],\"injectTo\":[\"text.html.markdown\"],\"injectionSelector\":\"L:text.html.markdown\",\"name\":\"markdown-nix\",\"patterns\":[{\"include\":\"#nix-code-block\"}],\"repository\":{\"nix-code-block\":{\"begin\":\"(^|\\\\G)(\\\\s*)(`{3,}|~{3,})\\\\s*(?i:(nix)(\\\\s+[^`~]*)?$)\",\"beginCaptures\":{\"3\":{\"name\":\"punctuation.definition.markdown\"},\"5\":{\"name\":\"fenced_code.block.language\"},\"6\":{\"name\":\"fenced_code.block.language.attributes\"}},\"end\":\"(^|\\\\G)(\\\\2|\\\\s{0,3})(\\\\3)\\\\s*$\",\"endCaptures\":{\"3\":{\"name\":\"punctuation.definition.markdown\"}},\"name\":\"markup.fenced_code.block.markdown\",\"patterns\":[{\"begin\":\"(^|\\\\G)(\\\\s*)(.*)\",\"contentName\":\"meta.embedded.block.nix\",\"patterns\":[{\"include\":\"source.nix\"}],\"while\":\"(^|\\\\G)(?!\\\\s*([`~]{3,})\\\\s*$)\"}]}},\"scopeName\":\"markdown.nix.codeblock\"}"))
+
+export default [
+lang
+]