Update index.rst #1303

Job	Run time
download_caravel	1m 56s
download_deps (pdk-with-volare)	4m 1s
download_deps (install_mcw)	3m 47s
download_deps (openlane)	1m 14s
download_deps (setup-timing-scripts)	43s
download_deps (precheck)	2m 14s
RTL-verification (sky130A)	6m 55s
hardening (sky130A)	55m 53s
RTL-verification (sky130B)	4m 58s
hardening (sky130B)	55m 45s
precheck (sky130A)	59m 36s
precheck (sky130B)	25m 17s
STA (sky130A)	8m 15s
	3h 50m 34s

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