Chore: Remove references to `topnav` #1660

Job	Run time
setup-matrix	10s
run-integration-tests (./examples/datasource-streaming-websocket/streaming-websocket-plugin)	3m 21s
run-integration-tests (./examples/datasource-http)	2m 42s
run-integration-tests (./examples/datasource-streaming-backend-websocket/streaming-backend-websoc...	3m 33s
run-integration-tests (./examples/app-with-dashboards)	2m 57s
run-integration-tests (./examples/datasource-basic)	4m 22s
run-integration-tests (./examples/app-with-backend)	3m 24s
run-integration-tests (./examples/app-with-extensions)	2m 56s
run-integration-tests (./examples/app-with-scenes)	3m 21s
run-integration-tests (./examples/app-with-service-account)	2m 45s
run-integration-tests (./examples/panel-frame-select)	2m 29s
run-integration-tests (./examples/datasource-http-backend)	5m 7s
run-integration-tests (./examples/app-with-rbac)	3m 15s
run-integration-tests (./examples/app-basic)	2m 52s
run-integration-tests (./examples/panel-datalinks)	2m 41s
run-integration-tests (./examples/panel-basic)	2m 52s
run-integration-tests (./examples/app-with-extension-point)	2m 26s
run-integration-tests (./examples/datasource-logs)	2m 36s
notify	0s
	53m 49s

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