docs: remove marketing fluff and emojis

- Remove navigation emojis from README and docs/README
- Remove "Made with ❤️ for the Kubernetes community" footer
- Remove checkmark/celebration emojis from quick-start guide
- Remove "(This!)" annotation from architecture diagrams
- Replace emoji references with plain text in features documentation
- Remove GOOD/BAD emojis from production deployment guide
- Simplify congratulations message

Generated with [Claude Code](https://claude.ai/code)
via [Happy](https://happy.engineering)

Co-Authored-By: Claude <noreply@anthropic.com>
Co-Authored-By: Happy <yesreply@happy.engineering>

docs/architecture/overview.md

@@ -32,7 +32,7 @@ The Headlamp Polaris Plugin is a **read-only dashboard** that surfaces Fairwinds
 │                   └────────┬────────┘                        │
 │                            │                                 │
 │              ┌─────────────▼──────────────┐                 │
-│              │  Polaris Plugin (This!)    │                 │
+│              │  Polaris Plugin     │                 │
 │              ├────────────────────────────┤                 │
 │              │ • registerSidebarEntry     │                 │
 │              │ • registerRoute            │                 │