simplify benchmarks page, let results speak for themselves

[cs01]

Summary

• Remove the "1st place / Top 3 / Total" summary stats bar
• Remove group headings (1st Place, Top 3, All Results)
• Remove badges (1st, Top 3) from individual cards
• Remove gold/muted card styling
• Just a clean flat grid of benchmark cards sorted by ChadScript's rank

Test plan

• Verify benchmarks page shows a flat grid with no grouping or badges

[github-actions]

Benchmark Results (Linux x86-64)

Benchmark	C	ChadScript	Go	Node	Bun	Place
Binary Trees	1.343s	1.202s	2.676s	1.126s	0.932s	🥉
Cold Start	1.0ms	0.9ms	1.5ms	26.7ms	9.9ms	🥇
Fibonacci	0.815s	1.476s	1.559s	3.158s	1.980s	🥈
File I/O	0.126s	0.087s	0.083s	0.192s	0.170s	🥈
JSON Parse/Stringify	0.004s	0.005s	0.017s	0.015s	0.007s	🥈
Matrix Multiply	0.446s	0.697s	0.612s	0.363s	0.339s	#5
Monte Carlo Pi	0.389s	0.410s	0.404s	2.248s	6.026s	🥉
N-Body Simulation	1.667s	2.120s	2.203s	2.408s	3.252s	🥈
Quicksort	0.215s	0.245s	0.213s	0.261s	0.226s	#4
SQLite	0.349s	0.400s	—	0.412s	0.403s	🥈
Sieve of Eratosthenes	0.015s	0.027s	0.020s	0.038s	0.035s	🥉
String Manipulation	0.008s	0.045s	0.016s	0.036s	0.027s	#5

CLI Tool Benchmarks

Benchmark	ChadScript	grep	node	xxd	Place
Hex Dump	0.423s	—	0.932s	0.129s	🥈
Recursive Grep	0.018s	0.009s	0.094s	—	🥈