Update notebook renderer sample

- Removes test related code since there are no tests
- Removes client/renderer split since there is only a renderer
- Simplify webpack logic to align with our webpack sample
- Document in top  level readme and improve docs

notebook-renderer-sample/src/render.ts

@@ -0,0 +1,60 @@
+// We've set up this sample using CSS modules, which lets you import class
+// names into JavaScript: https://github.com/css-modules/css-modules
+// You can configure or change this in the webpack.config.js file.
+import * as style from './style.css';
+import type { RendererContext } from 'vscode-notebook-renderer';
+
+interface IRenderInfo {
+  container: HTMLElement;
+  mime: string;
+  value: GitHubIssuesValue[];
+  context: RendererContext<unknown>;
+}
+interface GitHubIssuesValue {
+	title: string;
+	url: string;
+  body: string;
+}
+
+// This function is called to render your contents.
+export function render({ container, mime, value }: IRenderInfo) {
+  // Format the JSON and insert it as <pre><code>{ ... }</code></pre>
+  // Replace this with your custom code!
+  const pre = document.createElement('pre');
+  pre.classList.add(style.json);
+
+  // Create a simple table with issue titles and links
+  const table = document.createElement('table');
+  table.className = 'issues-list';
+  const headerRow = document.createElement('tr');
+  const tableHeaders = ['Issue', 'Description'];
+
+  tableHeaders.forEach(label => {
+    const header = document.createElement('th');
+    header.textContent = label;
+    headerRow.appendChild(header);
+  });
+
+  table.appendChild(headerRow);
+
+  value.forEach(item => {
+    const row = document.createElement('tr');
+
+    const title = document.createElement('td');
+    const link = document.createElement('a');
+    link.href = item.url;
+    link.textContent = item.title;
+    title.appendChild(link);
+    row.appendChild(title);
+
+    const body = document.createElement('td');
+    body.textContent = item.body;
+    row.appendChild(body);
+
+    table.appendChild(row);
+  });
+
+  pre.appendChild(table);
+  container.appendChild(pre);
+}
+