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/user-guide/features.md

@@ -117,13 +117,13 @@ Top-right corner of Headlamp shows a persistent cluster score badge.
 
 **Features:**
 - **Color-Coded Chip** - Green/Yellow/Red based on score
-- **Shield Emoji (🛡️)** - Visual indicator
+- **Shield Icon** - Visual indicator
 - **Score Percentage** - e.g., "85%"
 - **Clickable** - Click to navigate to Polaris overview
 - **Real-Time Updates** - Updates on auto-refresh interval
 - **Always Visible** - Appears on all Headlamp pages
 
-**Example:** `🛡️ 85%` (green chip)
+**Example:** Shield icon with "85%" (green chip)
 
 ## Settings & Configuration