update plugin.json according to grafana.org conventions
update plugin.json according to grafana.org conventions

jetscale/clickhouse-grafana,Vertamedia/clickhouse-grafana,Vertamedia/clickhouse-grafana,Vertamedia/clickhouse-grafana,Vertamedia/clickhouse-grafana,jetscale/clickhouse-grafana,Vertamedia/clickhouse-grafana,jetscale/clickhouse-grafana