docs: reordered docs for solvers and kernels #1550

Job	Run time
Run tests with pinned package versions (ubuntu-latest)	27m 58s
tests (3.9, ubuntu-latest)	28m 16s
tests (3.9, windows-latest)	32m 27s
Run tests with pinned package versions (windows-latest)	32m 22s
tests (3.10, ubuntu-latest)	15m 37s
tests (3.10, windows-latest)	17m 9s
Run tests with pinned package versions (macos-latest)	14m 50s
tests (3.10, macos-latest)	12m 29s
tests (3.11, ubuntu-latest)	15m 21s
tests (3.11, windows-latest)	17m 39s
tests (3.11, macos-latest)	13m 40s
tests (3.12, ubuntu-latest)	15m 40s
tests (3.12, windows-latest)	18m 12s
tests (3.12, macos-latest)	11m 38s
tests (3.9, macos-13)	30m 40s
	5h 3m 58s

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