add next steps to nav (#174)

Duh, I forgot to add the next-steps doc to the Nav sidebar...

docs/.vitepress/config.mts

@@ -57,6 +57,7 @@ export default defineConfig({
         items: [
           { text: 'Overview', link: '/docs/overview' },
           { text: 'Quick Start', link: '/docs/quick-start.md' },
+          { text: 'Next Steps', link: '/docs/next-steps.md' },
           { text: 'Use Cases', link: '/docs/use-cases' },
           { text: 'Why KitOps?', link: '/docs/why-kitops' },
         ]