docs: added nextra framework

docs/.gitignore

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+node_modules
+.next

docs/Dockerfile

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+FROM node:18-alpine
+WORKDIR /usr/app
+COPY package*.json ./
+RUN npm install
+COPY . ./
+RUN npm run build
+EXPOSE 8080
+CMD ["npm", "start"]

docs/components/hero.jsx

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+export function Hero() {
+  return (
+    <div className="py-10 md:p-20">
+      <div className="mb-5 text-center">
+        <div className="flex justify-center">
+          <img src="/logo.png" alt="Asteria logo" className="mb-4" />
+        </div>
+        <h1 className="flex flex-col flex-wrap font-bold text-4xl md:text-6xl lg:text-7xl dark:text-gray-200">
+          The power of eUTxO model
+        </h1>
+      </div>
+
+      <div className="mb-8 max-w-3xl text-center mx-auto">
+        <p className="md:text-lg text-gray-600 dark:text-gray-400">
+          Asteria is an open hackathon, a bot challenge that leverages the eUTxO model.
+          Players participate by moving a ship across a 2D grid and gathering resources. ADA rewards are available to players that reach the center of the gird.
+          All interactions from participants happen through on-chain transactions, forcing the developer to learn about the UTxO Model.
+          With ADA reward incentive and a compelling experience, we hope to attract developers from both inside and outside of the Cardano ecosystem
+        </p>
+      </div>
+
+      <div className="flex justify-center">
+        <a
+          className="bg-gradient-to-tl from-emerald-600 to-cyan-600 border border-transparent text-white text-sm rounded-md focus:outline-none focus:ring-2 focus:ring-blue-600 focus:ring-offset-2 focus:ring-offset-white py-3 px-4 dark:focus:ring-offset-gray-800"
+          href="/introduction"
+        >
+          Documentation
+        </a>
+      </div>
+    </div>
+  );
+}

docs/next.config.js

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+const withNextra = require('nextra')({
+  theme: 'nextra-theme-docs',
+  themeConfig: './theme.config.jsx'
+})
+
+module.exports = withNextra()
+