feat: scaffold starter template with TypeScript, CRD list view, CI, ArtifactHub

Adds full plugin starter template including:
- package.json with @kinvolk/headlamp-plugin devDependency and standard scripts
- tsconfig.json extending headlamp plugin config
- vitest.config.mts + vitest.setup.ts (jsdom, NODE_ENV=test, localStorage shim)
- src/index.tsx: registers sidebar entry and route for ResourceListPage
- src/components/ResourceListPage.tsx: placeholder CRD list view with TODO guide
- src/components/ResourceListPage.test.tsx: example tests using vi.mock pattern
- .github/workflows/ci.yaml: delegates to shared plugin-ci.yaml
- .github/workflows/release.yaml: delegates to shared plugin-release.yaml
- artifacthub-pkg.yml + artifacthub-repo.yml: ArtifactHub metadata with TODO markers
- renovate.json: Mend Renovate config for weekly dependency updates
- README.md: complete getting-started guide
- CONTRIBUTING.md: local dev, code style, testing, PR process
- LICENSE: Apache-2.0

Co-Authored-By: Paperclip <noreply@paperclip.ing>

src/index.tsx

@@ -0,0 +1,43 @@
+/**
+ * my-headlamp-plugin — entry point.
+ *
+ * Registers sidebar entries and routes for this Headlamp plugin.
+ * Replace the sidebar labels, URLs, and route component with your own.
+ */
+
+import { registerRoute, registerSidebarEntry } from '@kinvolk/headlamp-plugin/lib';
+import React from 'react';
+import ResourceListPage from './components/ResourceListPage';
+
+// ---------------------------------------------------------------------------
+// Sidebar entries
+// ---------------------------------------------------------------------------
+
+// Top-level sidebar section (parent = null creates a new group in the nav)
+registerSidebarEntry({
+  parent: null,
+  name: 'my-plugin',
+  label: 'My Plugin',
+  url: '/my-plugin',
+  icon: 'mdi:kubernetes',
+});
+
+// Child entry — shown nested under the parent section above
+registerSidebarEntry({
+  parent: 'my-plugin',
+  name: 'my-plugin-list',
+  label: 'Resources',
+  url: '/my-plugin',
+});
+
+// ---------------------------------------------------------------------------
+// Routes
+// ---------------------------------------------------------------------------
+
+registerRoute({
+  path: '/my-plugin',
+  sidebar: 'my-plugin-list',
+  name: 'my-plugin-list',
+  exact: true,
+  component: () => <ResourceListPage />,
+});