Perf measurements link (https://circt.org/perf/) broken

On the bottom of https://circt.llvm.org/ it says "Nightly performance plots: https://circt.org/perf/" but this does not work. Given that the main page is at https://circt.llvm.org/ I tried https://circt.llvm.org/perf/ but that is a 404.

If the data is available elsewhere, the link could be fixed, or if it is not gathered anywhere, that line could be deleted from the docs.

Start at the bottom of https://circt.llvm.org/ and inspect the "Nightly performance plots" link, then check whether the performance data is available at another location. Done means the link points to a working destination or the outdated line is removed, with the page checked for a working result.

Written by the indexing model from the issue text.