fix: update community Slack link (#10360)
fix: update community Slack link (#10360)


mistercrunch/panoramix,mistercrunch/panoramix,airbnb/superset,apache/incubator-superset,zhouyao1994/incubator-superset,zhouyao1994/incubator-superset,airbnb/caravel,apache/incubator-superset,mistercrunch/panoramix,airbnb/caravel,zhouyao1994/incubator-superset,zhouyao1994/incubator-superset,airbnb/superset,apache/incubator-superset,airbnb/caravel,mistercrunch/panoramix,airbnb/superset,airbnb/caravel,apache/incubator-superset,airbnb/superset,zhouyao1994/incubator-superset,apache/incubator-superset