Use new logo in performance reports

[jrbourbeau]

This updates the favicon used in our performance reports to use our new logo

cc @jacobtomlinson @scharlottej13

[jrbourbeau]

FWIW I'm not sure why there's no longer a static favicon.ico file in this location. However, after looking at dask/dask-sphinx-theme#67, it appears we're putting favicon.svg here so I updated this logic to use that file instead. I confirmed the new logo is used when I locally produce a performance report.

[mrocklin]

Can we also replace the old .ico file? This might have been used elsewhere.

[jrbourbeau]

Fair point. That would fix the issue with performance reports, and possibly other places too. I'm not sure where the .ico file is being produced -- @scharlottej13 perhaps you have some insight here?

[scharlottej13]

Fair point. That would fix the issue with performance reports, and possibly other places too. I'm not sure where the .ico file is being produced -- @scharlottej13 perhaps you have some insight here?

I think it also comes from the dask-sphinx-theme-- I can update this!

[github-actions]

Unit Test Results

       15 files  +       3         15 suites  +3   6h 12m 14s ⏱️ + 1h 39m 44s
  2 841 tests ±       0    2 759 ✔️ +     13    81 💤  -   13  1 ❌ +1 
21 051 runs  +4 030  20 102 ✔️ +3 921  948 💤 +109  1 ❌ +1 

For more details on these failures, see this check.

Results for commit f1c7d15. ± Comparison against base commit c014e5b.

[jrbourbeau]

@scharlottej13 updated favicon.ico over in dask/dask-sphinx-theme#73 which is included in the latest dask-sphinx-theme=3.0.1 release. Closing this PR as I can confirm the new dask-sphinx-theme release fixes this issue without any code changes to distributed