Docs site poc (#346)

add docusaurus based docs site under /docs

docs/src/components/HomepageFeatures/index.tsx

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+import React from "react";
+import clsx from "clsx";
+import styles from "./styles.module.css";
+
+type FeatureItem = {
+  title: string;
+  Svg: React.ComponentType<React.ComponentProps<"svg">>;
+  description: JSX.Element;
+};
+
+const FeatureList: FeatureItem[] = [
+  {
+    title: "Your conversational assistant",
+    Svg: require("@site/static/img/logo.svg").default,
+    description: (
+      <>
+        State-of-the-Art chat assistant that can be personalized to your needs.
+      </>
+    ),
+  },
+  {
+    title: "Retrieval via Search Engines",
+    Svg: require("@site/static/img/logo.svg").default,
+    description: (
+      <>External, upgradeable knowledge: No need for billions of parameters.</>
+    ),
+  },
+  {
+    title: "A building block for developers",
+    Svg: require("@site/static/img/logo.svg").default,
+    description: <>Integrate OpenAssistant into your application.</>,
+  },
+];
+
+function Feature({ title, Svg, description }: FeatureItem) {
+  return (
+    <div className={clsx("col col--4")}>
+      <div className="text--center">
+        <Svg className={styles.featureSvg} role="img" />
+      </div>
+      <div className="text--center padding-horiz--md">
+        <h3>{title}</h3>
+        <p>{description}</p>
+      </div>
+    </div>
+  );
+}
+
+export default function HomepageFeatures(): JSX.Element {
+  return (
+    <section className={styles.features}>
+      <div className="container">
+        <div className="row">
+          {FeatureList.map((props, idx) => (
+            <Feature key={idx} {...props} />
+          ))}
+        </div>
+      </div>
+    </section>
+  );
+}

docs/src/components/HomepageFeatures/styles.module.css

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+.features {
+  display: flex;
+  align-items: center;
+  padding: 2rem 0;
+  width: 100%;
+}
+
+.featureSvg {
+  height: 200px;
+  width: 200px;
+}

docs/src/css/custom.css

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+/**
+ * Any CSS included here will be global. The classic template
+ * bundles Infima by default. Infima is a CSS framework designed to
+ * work well for content-centric websites.
+ */
+
+/* You can override the default Infima variables here. */
+:root {
+  --ifm-color-primary: #307bf3;
+  --ifm-color-primary-dark: #0d5ddf;
+  --ifm-color-primary-darker: #0d5ddf;
+  --ifm-color-primary-darkest: #0944a1;
+  --ifm-color-primary-light: #307bf3;
+  --ifm-color-primary-lighter: #307bf3;
+  --ifm-color-primary-lightest: #307bf3;
+  --ifm-code-font-size: 95%;
+  --docusaurus-highlighted-code-line-bg: rgba(0, 0, 0, 0.1);
+}
+
+/* For readability concerns, you should choose a lighter palette in dark mode. */
+[data-theme="dark"] {
+  --ifm-color-primary: #307bf3;
+  --ifm-color-primary-dark: #0d5ddf;
+  --ifm-color-primary-darker: #0d5ddf;
+  --ifm-color-primary-darkest: #0944a1;
+  --ifm-color-primary-light: #307bf3;
+  --ifm-color-primary-lighter: #307bf3;
+  --ifm-color-primary-lightest: #307bf3;
+  --docusaurus-highlighted-code-line-bg: rgba(0, 0, 0, 0.3);
+}

docs/src/pages/index.module.css

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+/**
+ * CSS files with the .module.css suffix will be treated as CSS modules
+ * and scoped locally.
+ */
+
+.heroBanner {
+  padding: 4rem 0;
+  text-align: center;
+  position: relative;
+  overflow: hidden;
+}
+
+@media screen and (max-width: 996px) {
+  .heroBanner {
+    padding: 2rem;
+  }
+}
+
+.buttons {
+  display: flex;
+  align-items: center;
+  justify-content: center;
+}

docs/src/pages/index.tsx

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+import React from "react";
+import clsx from "clsx";
+import Link from "@docusaurus/Link";
+import useDocusaurusContext from "@docusaurus/useDocusaurusContext";
+import Layout from "@theme/Layout";
+import HomepageFeatures from "@site/src/components/HomepageFeatures";
+
+import styles from "./index.module.css";
+
+function HomepageHeader() {
+  const { siteConfig } = useDocusaurusContext();
+  return (
+    <header className={clsx("hero hero--primary", styles.heroBanner)}>
+      <div className="container">
+        <h1 className="hero__title">{siteConfig.title}</h1>
+        <p className="hero__subtitle">{siteConfig.tagline}</p>
+        <div className={styles.buttons}>
+          <Link
+            className="button button--secondary button--lg"
+            to="/docs/intro"
+          >
+            Open Assistant Introduction
+          </Link>
+        </div>
+      </div>
+    </header>
+  );
+}
+
+export default function Home(): JSX.Element {
+  const { siteConfig } = useDocusaurusContext();
+  return (
+    <Layout
+      title={`${siteConfig.title}`}
+      description="OpenAssistant is a state-of-the-art chat assistant that can be personalized to your needs."
+    >
+      <HomepageHeader />
+      <main>
+        <HomepageFeatures />
+      </main>
+    </Layout>
+  );
+}