Enhance documentation and configuration for MVK; add starlight-heading-badges integration, update guides, and improve clarity in existing content.

astro.config.mjs

@@ -1,11 +1,13 @@
 // @ts-check
 import { defineConfig } from 'astro/config';
 import starlight from '@astrojs/starlight';
+import starlightHeadingBadges from 'starlight-heading-badges'
 
 // https://astro.build/config
 export default defineConfig({
 	integrations: [
 		starlight({
+			plugins: [starlightHeadingBadges()],
 			title: 'MinimalViableK8s',
 			social: [{ icon: 'github', label: 'GitHub', href: 'https://codeberg.org/headshed/infctl-cli' }],
 			head: [