webui: server-side sectors page rendering #273

Job	Run time
ci-lint	21s
build-debug	4m 16s
build-forest	4m 20s
build-2k	4m 18s
build-calibnet	4m 17s
build-mainnet	4m 20s
gen-check	5m 8s
gofmt	21s
lint	3m 29s
mod-tidy-check	29s
setup-params	5s
test (test-itest-curio, ./itests/curio_test.go)	4m 54s
test (test-all, `go list ./... \| grep -v curio/itests`)	3m 4s
test (test-itest-harmonyDB, ./itests/harmonydb_test.go)	3m 6s
test (test-itest-alertnow, ./itests/alertnow_test.go)	1m 57s
	44m 25s

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