web: remove defunct stats sites #3727

Job	Run time
libs-build	5m 55s
client-armv6-build	3m 16s
apps-build	9m 56s
client-arm-build	3m 8s
libs-cmake-build	7m 7s
client-arm64-build	3m 10s
client-x86-build	3m 16s
client-x86_64-build	3m 16s
manager-build (assembleRelease)	3m 39s
manager-build (assembleXiaomi_release)	4m 5s
manager-build (assembleArmv6_release)	4m 45s
manager-build (jacocoTestReportDebug)	5m 31s
	57m 4s

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