Refresh README, docs landing page, and scaling plots (#1152) #4263

Job	Run time
Lint Gate	1m 15s
Detect File Changes	9s
Github (macos, mpi, no-debug, false)	1h 7m 16s
Github (ubuntu, mpi, no-debug, false)	2h 16m 14s
Oak Ridge \| Frontier (gpu-omp)	2h 57m 34s
Github (ubuntu, mpi, debug, false)	1h 53m 9s
Github (ubuntu, mpi, debug, true)	1h 40m 31s
Georgia Tech \| Phoenix (gpu-omp)	1h 26m 43s
Oak Ridge \| Frontier (gpu-acc)	13m 5s
Oak Ridge \| Frontier (cpu)	1s
Github (ubuntu, no-mpi, single, no-debug, false)	27m 23s
Georgia Tech \| Phoenix (cpu)	1h 15m 32s
Github (ubuntu, mpi, no-debug, true)	1h 32m 58s
Oak Ridge \| Frontier (AMD) (gpu-omp)	1s
Github (macos, mpi, debug, false)	55m 49s
Georgia Tech \| Phoenix (gpu-acc)	1h 28m 13s
Oak Ridge \| Frontier (AMD) (cpu)	1s
	17h 15m 54s

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