website: resize images over 1080p #13150

Job	Run time
lint-golint	36s
test-unittest	34s
ci-outpost-mark	1s
build-container (proxy)	11m 34s
build-container (ldap)	13m 29s
build-container (radius)	11m 24s
build-binary (proxy, linux, amd64)	3m 2s
build-binary (proxy, linux, arm64)	3m 55s
build-binary (ldap, linux, amd64)	2m 41s
build-binary (ldap, linux, arm64)	2m 28s
build-binary (radius, linux, amd64)	2m 32s
build-binary (radius, linux, arm64)	2m 36s
	54m 52s

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