Init landing page (#14)

This PR inits the gatsby project for the landing page. In the next steps
let's add configuration for `eslint` and other needed things. Gatsby was
chosen because it is greatly optimized for SEO.

website/.gitignore

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+node_modules/
+.cache/
+public
+src/gatsby-types.d.ts

website/README.md

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+# Acre website
+
+## Installation
+
+1.  Install dependencies and start the app.
+    ```bash
+    yarn install
+    yarn start
+    ```
+2.  Open [http://localhost:8000](http://localhost:8000) to view it in the browser.

website/gatsby-config.ts

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+import type { GatsbyConfig } from "gatsby"
+
+const config: GatsbyConfig = {
+  siteMetadata: {
+    // TODO: Update the needed data when the final domain name will be ready.
+    siteUrl: `https://www.yourdomain.tld`,
+  },
+  graphqlTypegen: true,
+  plugins: [],
+}
+
+export default config

website/package.json

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+{
+  "name": "website",
+  "version": "1.0.0",
+  "private": true,
+  "description": "Acre website",
+  "keywords": [
+    "gatsby"
+  ],
+  "scripts": {
+    "start": "gatsby develop",
+    "build": "gatsby build",
+    "serve": "gatsby serve",
+    "clean": "gatsby clean",
+    "typecheck": "tsc --noEmit"
+  },
+  "dependencies": {
+    "gatsby": "^5.12.4",
+    "react": "^18.2.0",
+    "react-dom": "^18.2.0"
+  },
+  "devDependencies": {
+    "@types/node": "^20.3.3",
+    "@types/react": "^18.2.14",
+    "@types/react-dom": "^18.2.6",
+    "typescript": "^5.2.2"
+  }
+}

website/src/pages/404.tsx

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+import * as React from "react";
+import { HeadFC, PageProps } from "gatsby";
+
+const NotFoundPage: React.FC<PageProps> = () => {
+  return (
+    <main>
+      <h1>Page not found</h1>
+    </main>
+  );
+};
+
+export default NotFoundPage;
+
+export const Head: HeadFC = () => <title>Not found</title>;

website/src/pages/index.tsx

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+import * as React from "react";
+import type { HeadFC, PageProps } from "gatsby";
+
+const IndexPage: React.FC<PageProps> = () => {
+  return (
+    <main>
+      <h1>Landing page</h1>
+    </main>
+  );
+};
+
+export default IndexPage;
+
+export const Head: HeadFC = () => <title>Home Page</title>;

website/tsconfig.json

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+{
+  "compilerOptions": {
+    "target": "esnext",
+    "lib": ["dom", "esnext"],
+    "jsx": "react",
+    "module": "esnext",
+    "moduleResolution": "node",
+    "esModuleInterop": true,
+    "forceConsistentCasingInFileNames": true,
+    "strict": true,
+    "skipLibCheck": true
+  },
+  "include": [
+    "./src/**/*",
+    "./gatsby-node.ts",
+    "./gatsby-config.ts",
+    "./plugins/**/*"
+  ]
+}