revamp landing page, docs nav, and pipeline animation

[cs01]

Summary

• Redesigned landing page around three story sections: It's Fast (benchmarks), It's Familiar (language features + code example), It's Friendly (stdlib grid + production links)
• Built pipeline compilation animation: source code → AST overlays → block grid → analyze scan → column stack → IR morph → 3D cube binary output
• Simplified docs nav to three top-level items (Docs, Standard Library, Benchmarks) with separate sidebars
• Fixed benchmark label sig figs for ChadScript, removed place badges, added grep/xxd to comparisons
• Updated copy throughout to brand as systems programming language targeting LLVM
• Cleaned up README with fast/familiar/friendly sections and docs links at top
• Deleted redundant why-chadscript page (content absorbed into landing page)

Test plan

• Preview docs site locally with npx vitepress dev docs
• Verify pipeline animation plays through all stages and replay works
• Check all nav links work (docs sidebar, stdlib sidebar, benchmarks)
• Verify responsive layout on mobile
• CI passes

🤖 Generated with Claude Code

[github-actions]

Benchmark Results (Linux x86-64)

Benchmark	C	ChadScript	Go	Node	Bun	Place
Binary Trees	1.584s	1.449s	2.734s	1.222s	0.993s	🥉
Cold Start	0.8ms	0.9ms	1.2ms	24.8ms	9.6ms	🥈
Fibonacci	0.814s	1.556s	1.607s	3.169s	1.952s	🥈
File I/O	0.118s	0.091s	0.088s	0.206s	0.174s	🥈
JSON Parse/Stringify	0.004s	0.005s	0.018s	0.018s	0.008s	🥈
Matrix Multiply	0.448s	0.699s	0.573s	0.372s	0.333s	#5
Monte Carlo Pi	0.390s	0.411s	0.405s	2.249s	6.046s	🥉
N-Body Simulation	1.665s	2.123s	2.215s	2.383s	3.273s	🥈
Quicksort	0.215s	0.245s	0.213s	0.262s	0.228s	#4
SQLite	0.351s	0.401s	—	0.465s	0.400s	🥉
Sieve of Eratosthenes	0.014s	0.029s	0.018s	0.040s	0.036s	🥉
String Manipulation	0.008s	0.046s	0.016s	0.037s	0.028s	#5

CLI Tool Benchmarks

Benchmark	ChadScript	grep	node	xxd	Place
Hex Dump	0.428s	—	1.018s	0.129s	🥈
Recursive Grep	0.020s	0.011s	0.096s	—	🥈