dasboard/app: redesing of navbar #17566

Job	Run time
aux	3m 46s
dashboard	2m 32s
gvisor	3m 56s
race	9m 6s
arch (presubmit_arch_linux)	10m 17s
arch (presubmit_arch_freebsd)	6m 15s
old	7m 15s
race_dashboard	3m 22s
arch (presubmit_arch_darwin)	3m 40s
arch (presubmit_arch_netbsd)	3m 44s
build	3m 22s
arch (presubmit_arch_executor)	3m 12s
arch (presubmit_arch_openbsd)	3m 41s
arch (presubmit_arch_windows)	3m 27s
	1h 7m 35s

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