docs: change cpu/mem panel to time-series (#4844) #27

Job	Run time
Build GreptimeDB binaries (ubuntu-20.04)	4m 14s
Build GreptimeDB binary (profile-CI) (ubuntu-20.04)	3m 55s
Check (windows-2022)	10m 32s
Check (ubuntu-20.04)	3m 13s
Check typos and docs	7s
Clippy	3m 57s
coverage	1s
Rustfmt	1m 9s
Check License Header	2m 10s
Toml Check	1m 10s
Unstable Fuzz Test (unstable_fuzz_create_table_standalone)	1m 8s
Fuzz Test with Chaos (Distributed, Remote WAL, fuzz_migrate_mito_regions)	3m 44s
Fuzz Test (Distributed, Remote WAL, fuzz_create_table)	3m 30s
Fuzz Test with Chaos (Distributed, Remote WAL, fuzz_failover_mito_regions)	3m 45s
Fuzz Test (Distributed, Remote WAL, fuzz_alter_table)	3m 30s
Fuzz Test with Chaos (Distributed, Remote WAL, fuzz_failover_metric_regions)	3m 30s
Fuzz Test (Distributed, Remote WAL, fuzz_create_database)	3m 31s
Fuzz Test with Chaos (Distributed, Local WAL, fuzz_migrate_mito_regions)	3m 43s
Fuzz Test (Distributed, Remote WAL, fuzz_create_logical_table)	3m 37s
Fuzz Test (Distributed, Remote WAL, fuzz_alter_logical_table)	3m 31s
Fuzz Test (Distributed, Remote WAL, fuzz_insert)	3m 25s
Fuzz Test (Distributed, Remote WAL, fuzz_insert_logical_table)	3m 30s
Sqlness Test (Basic)	3m 6s
Fuzz Test (fuzz_create_table)	1m 37s
Sqlness Test (Remote WAL)	3m 31s
Fuzz Test (fuzz_alter_table)	1m 36s
Fuzz Test (fuzz_create_database)	1m 31s
Fuzz Test (fuzz_create_logical_table)	1m 13s
Fuzz Test (fuzz_alter_logical_table)	1m 39s
Fuzz Test (fuzz_insert)	1m 16s
Fuzz Test (fuzz_insert_logical_table)	1m 15s
	1h 27m 36s

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