Add summary of the rustworkx benchmarks to the documentation

[cometta]

benchmark of https://github.com/mtreinish/retworkx-comparison-benchmarks . Refer to issue #550

[IvanIsCoding]

Thanks for taking care of this. I have three minor comments regarding the images:

• we might need to increase the axis on the Time to create a weighted directed graph
• we need to update the captions to say rustworkx not retworkx
• Because we are on the web I think saving the image as an .svg might be better than using .png

[coveralls]

Pull Request Test Coverage Report for Build 3510505910

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-0.05%) to 96.924%

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Totals
Change from base Build 3503349955:	-0.05%
Covered Lines:	13328
Relevant Lines:	13751

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💛 - Coveralls

[cometta]

I made changes according to your comments. Let me know if anything else pending

[IvanIsCoding]

I made changes according to your comments. Let me know if anything else pending

Can you run pip show <package> for each graph package and post the configuration of your system (e.g. Ubuntu 22.04 with AMD Ryzen XYZ and 128Gb of RAM) on the comments for this PR?

I will take over and add these details and the citations for where we grabbed the datasets, then we should be good to go

[cometta]

build from main branch https://git.skewed.de/count0/graph-tool.git, Debian GNU/Linux 11 (bullseye), Intel i9-9900K 32Gb of ram

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