WEB: Add page about benchmarks
CC: @DeaMariaLeon @rhshadrach @lithomas1 

This is not yet ready, the conbench url provided is not correctly rendering the css, and I need to add all the information about the OVH server, but opening early in case you have any feedback.

Hm, the ASV link for the OVH results seem to be dead add clicking on any of the times for the runs for the conbench results also gets me a 404.

Is this expected? The links on the conbench runs don't work either. 
Plus if the menu is not available, one cannot give feedback.  

The server where I setup conbench is here and it works: http://57.128.112.95:5000/
Adding it to pandas' website caused this problem with css - I'm working on it. 
I think I found the reason, but to fix it I will have to take the server down for a bit. 



 Thanks for the heads up @lithomas1. I'm now synching the asv website to /benchmarks/asv/.  Hopefully we'll have the conbench site rendering with the css/js soon.

Any other feedback very welcome.  @lithomas1 @rhshadrach any feedback here before I merge? There will surely be follow ups on this, but I think for now it adds value as it is. Just to be clear for other people who may read this, regarding:

>the conbench url provided is not correctly rendering the css

Actually, conbench does not currently support this kind of URL. It might in the future. Details about this are here: https://github.com/conbench/conbench/issues/1575#:~:text=We%20did%20not%20build%20(test%2C%20qualify)%20for%20deploying%20the%20Conbench%20web%20application%20at%20a%20non%2Droot%20path%20yet.

 This LGTM.

Thanks for writing this up. Thanks @datapythonista 