docs: add personalized PageRank gallery example #1759

Job	Run time
Build wheels on Linux (i686)	19m 0s
Build wheels on Linux (x86_64)	24m 34s
Build wheels on Linux (aarch64/manylinux)	16m 26s
Build wheels on macOS (arm64)	8m 26s
Build with sanitizers for debugging purposes	2m 14s
Build wheels for WebAssembly	6m 22s
Build wheels on macOS (x86_64)	16m 58s
Build sdist and test extra dependencies	2m 6s
Build wheels on Linux (aarch64/musllinux)	9m 14s
Build wheels on Windows (x64)	25m 59s
Build wheels on Windows (Win32)	8m 59s
	2h 20m 18s

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