Add links to talks about `python-graphblas` and GraphBLAS to docs

[eriknw]

How/where should we list presentations given about GraphBLAS?

• "Building a Faster NetworkX-like Library Using GraphBLAS" | PyOhio 2022
  • https://www.youtube.com/watch?v=lVkkBj6m9K0
• "GraphBLAS and NetworkX" Lightning Talk | PyData NYC 2022
  • www.youtube.com/watch?v=XGoel7XmrwU&t=30m12s
• "100x Faster NetworkX: Dispatching to GraphBLAS" | PyData Global 2022
  • https://www.youtube.com/watch?v=FCwTMQLH2Kc

Should we also include some GraphBLAS talks that don't use python-graphblas from GraphBLAS-Pointers? It might be helpful to list a talk and/or tutorial that are our recommendations for learning GraphBLAS. Any suggestions? How should we order them--by date (as done above) or by recommended watch order?

Should we embed any of these in the graphblas-algorithms README.md?

CC @sneakers-the-rat and @szhorvat: maybe we should have pointed y'all to these when the pyos review started--my bad!

[sneakers-the-rat]

thanks for letting us know :)

Should we embed any of these in the graphblas-algorithms README.md?

def recommend making a top-level "examples" section in the docs where you can embed notebooks ( re: https://github.com/python-graphblas/python-graphblas/issues/408 ) and also have a page to link out to your talks :)