Link to benchmark results on pascal

The results on the `pascal` machine are likely to be more representative of
relative performance than on the older Opteron based `fermat` machine.

README.md

@@ -1,6 +1,7 @@
 [API Reference](https://ocaml-multicore.github.io/saturn/) ·
-[Benchmarks](https://bench.ci.dev/ocaml-multicore/saturn/branch/main) ·
-[Stdlib Benchmarks](https://bench.ci.dev/ocaml-multicore/multicore-bench/branch/main)
+[Benchmarks](https://bench.ci.dev/ocaml-multicore/saturn/branch/main?worker=pascal&image=bench.Dockerfile)
+·
+[Stdlib Benchmarks](https://bench.ci.dev/ocaml-multicore/multicore-bench/branch/main?worker=pascal&image=bench.Dockerfile)
 
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