Code examples link leads to non-existing page

The “Code examples” button on benchmark pages seems to be missing the domain. For example, on https://www.brain-score.org/benchmark/vision/328, clicking the button leads to [this broken link](https://github.com/brain-score//tree/master/examples) instead of the [correct link](https://github.com/brain-score/vision/tree/master/examples)

I took a look at the code, and I think the fix would just require changing the `benchmark.domain` field to `benchmark.benchmark_type.domain` inside the `benchmarks.html` file. I can draft up a quick PR to fix this if you'd like.

Open benchmarks.html and trace how the Code examples button builds its GitHub href for benchmark pages. Reproduce the link from benchmark 328, then verify that it includes the vision domain and points to the existing examples directory.

Written by the indexing model from the issue text.