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/mdast-util-to-markdown/lib/util/container-flow.d.ts

@@ -0,0 +1,19 @@
+/**
+ * @import {State} from 'mdast-util-to-markdown'
+ * @import {FlowChildren, FlowParents, TrackFields} from '../types.js'
+ */
+/**
+ * @param {FlowParents} parent
+ *   Parent of flow nodes.
+ * @param {State} state
+ *   Info passed around about the current state.
+ * @param {TrackFields} info
+ *   Info on where we are in the document we are generating.
+ * @returns {string}
+ *   Serialized children, joined by (blank) lines.
+ */
+export function containerFlow(parent: FlowParents, state: State, info: TrackFields): string;
+import type { FlowParents } from '../types.js';
+import type { State } from 'mdast-util-to-markdown';
+import type { TrackFields } from '../types.js';
+//# sourceMappingURL=container-flow.d.ts.map