🎨 Palette: Documentation scannability and CLI instruction improvements

[google-labs-jules]

💡 What: The UX enhancement added

• Added descriptive emojis (🤖, 🕸️, 🚀, 🌊, ⚡, 🪣, 📥) to all documentation navigation points and headings.
• Fixed spelling errors in docs/CONTRIBUTING.md.
• Updated AGENTS.md with the correct mise run rename command syntax.
• Updated .template/docs/template.md to include a default emoji for newly created templates.

🎯 Why: The user problem it solves

• Scannability: Large lists of templates are hard to parse quickly. Emojis provide instant visual recognition of the template type (e.g., database stream vs. REST API).
• Correctness: Typos in documentation reduce trust and clarity.
• Discoverability: Providing the exact CLI command with flags in AGENTS.md makes it easier for AI agents and developers to correctly initialize their projects.

♿ Accessibility: Any a11y improvements made

• Improved the logical grouping and visual identification of documentation sections.
• Ensured consistency across the primary user interface of this repository (the MkDocs documentation).

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PR created automatically by Jules for task 7503576457034685316 started by @amrabed

[google-labs-jules]

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