Implement *_reply for the web

Also, start extracting shared components

website/src/components/Button.tsx

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+import clsx from "clsx";
+
+export const Button = (
+  props: React.DetailedHTMLProps<React.ButtonHTMLAttributes<HTMLButtonElement>, HTMLButtonElement>
+) => {
+  const { className, children, ...rest } = props;
+  return (
+    <button
+      type="button"
+      className={clsx(
+        "inline-flex items-center rounded-md border border-transparent px-4 py-2 text-sm font-medium focus:outline-none focus:ring-2 focus:ring-indigo-500 focus:ring-offset-2",
+        className
+      )}
+      {...rest}
+    >
+      {children}
+    </button>
+  );
+};

website/src/components/Messages.tsx

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+export interface Message {
+  text: string;
+  is_assistant: boolean;
+}
+
+const getColor = (isAssistant: boolean) => (isAssistant ? "bg-slate-800" : "bg-sky-900");
+
+export const Messages = ({ messages }: { messages: Message[] }) => {
+  const items = messages.map(({ text, is_assistant }: Message, i: number) => {
+    return (
+      <div key={i + text} className={`${getColor(is_assistant)} p-4 my-1 rounded-xl text-white whitespace-pre-wrap`}>
+        {text}
+      </div>
+    );
+  });
+  // Maybe also show a legend of the colors?
+  return <>{items}</>;
+};

website/src/components/TwoColumns.tsx

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+export const TwoColumns = ({ children }: { children: React.ReactNode[] }) => {
+  if (!Array.isArray(children) || children.length !== 2) {
+    throw new Error("TwoColumns expects 2 children");
+  }
+
+  const [first, second] = children;
+
+  return (
+    <section className="mb-8 lt-lg:mb-12 grid lg:gap-x-12 lg:grid-cols-2">
+      <div className="rounded-lg shadow-lg h-full block bg-white p-6">{first}</div>
+      <div className="rounded-lg shadow-lg h-full block bg-white p-6 mt-6 lg:mt-0">{second}</div>
+    </section>
+  );
+};