Remove code for old benchmarks website

[AdamGS]

Summary

Just not sure why its still there? Removed the old code and renamed the new website

[codspeed-hq]

Merging this PR will degrade performance by 14.78%

❌ 1 regressed benchmark
✅ 953 untouched benchmarks
⏩ 1466 skipped benchmarks¹

⚠️ Please fix the performance issues or acknowledge them on CodSpeed.

Performance Changes

	Mode	Benchmark	BASE	HEAD	Efficiency
❌	Simulation	chunked_opt_bool_canonical_into[(10, 1000)]	1.4 ms	1.6 ms	-14.78%

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_{Comparing adamg/cleanup-old-benchmarks-website (d856591) with develop (24f57f6)}

Footnotes

1. 1466 benchmarks were skipped, so the baseline results were used instead. If they were deleted from the codebase, click here and archive them to remove them from the performance reports. ↩

[palaska]

Summary

Just not sure why its still there? Removed the old code and renamed the new website

👍 I left it so we can switch to the old website with one DNS record change but I guess we have given enough soak time at this point.