improve model registry - add thumbnails #102

Job	Run time
deploy-caddy	0s
test (gno.land/r/linker000/discord/keyring/v0)	9s
test (gno.land/r/linker000/discord/role/v0)	9s
test (gno.land/r/linker000/discord/user/v0)	12s
deploy-gnoland	0s
	30s

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