Cleanup Benchmark Docs

[guarin]

Description

The bechmark docs page is quite outdated and doesn't look very nice. It could do with some love.

https://docs.lightly.ai/self-supervised-learning/getting_started/benchmarks.html

Tasks

• [ ] Cleanup the benchmark page and make it more appealing
• [ ] Remove outdated/deprecated content
• [x] Make tables in readme, benchmark scripts, and benchmark docs consistent (epochs, batch size order!)

[Aienthu1]

@guarin Can you assign me this issue ?

[guarin]

Hey, thanks for your interested on working on this issue. I think this issue is not a good first issue and we'll need some more internal discussions on how to update the benchmarks page.