Update contact page to point to Slack rather than IRC
Update contact page to point to Slack rather than IRC

Patch by Jeremy Hanna, Reviewed by Michael Shuler for CASSANDRA-15150

snazy/cassandra,belliottsmith/cassandra,instaclustr/cassandra,szhou1234/cassandra,blambov/cassandra,Instagram/cassandra,cooldoger/cassandra,jasonstack/cassandra,blambov/cassandra,jbellis/cassandra,pauloricardomg/cassandra,belliottsmith/cassandra,jeffjirsa/cassandra,bdeggleston/cassandra,ifesdjeen/cassandra,aboudreault/cassandra,belliottsmith/cassandra,adejanovski/cassandra,bcoverston/cassandra,apache/cassandra,tjake/cassandra,beobal/cassandra,bcoverston/cassandra,cooldoger/cassandra,iamaleksey/cassandra,snazy/cassandra,adelapena/cassandra,aboudreault/cassandra,bdeggleston/cassandra,mshuler/cassandra,stef1927/cassandra,ifesdjeen/cassandra,kgreav/cassandra,michaelsembwever/cassandra,yukim/cassandra,cooldoger/cassandra,apache/cassandra,clohfink/cassandra,adejanovski/cassandra,snazy/cassandra,pauloricardomg/cassandra,jrwest/cassandra,jasonstack/cassandra,blambov/cassandra,iamaleksey/cassandra,mshuler/cassandra,yukim/cassandra,szhou1234/cassandra,jeromatron/cassandra,blerer/cassandra,yukim/cassandra,stef1927/cassandra,ifesdjeen/cassandra,adelapena/cassandra,jrwest/cassandra,jrwest/cassandra,iamaleksey/cassandra,jbellis/cassandra,jeffjirsa/cassandra,jeromatron/cassandra,adejanovski/cassandra,bcoverston/cassandra,instaclustr/cassandra,blerer/cassandra,tjake/cassandra,szhou1234/cassandra,bdeggleston/cassandra,krummas/cassandra,szhou1234/cassandra,jeromatron/cassandra,thelastpickle/cassandra,apache/cassandra,blerer/cassandra,Instagram/cassandra,adelapena/cassandra,thelastpickle/cassandra,driftx/cassandra,jeffjirsa/cassandra,Instagram/cassandra,Instagram/cassandra,bdeggleston/cassandra,ifesdjeen/cassandra,tjake/cassandra,beobal/cassandra,mike-tr-adamson/cassandra,tjake/cassandra,clohfink/cassandra,pauloricardomg/cassandra,driftx/cassandra,aboudreault/cassandra,michaelsembwever/cassandra,jeffjirsa/cassandra,yukim/cassandra,beobal/cassandra,mike-tr-adamson/cassandra,kgreav/cassandra,bcoverston/cassandra,mike-tr-adamson/cassandra,iamaleksey/cassandra,driftx/cassandra,blambov/cassandra,krummas/cassandra,michaelsembwever/cassandra,thelastpickle/cassandra,instaclustr/cassandra,blerer/cassandra,stef1927/cassandra,jrwest/cassandra,jbellis/cassandra,clohfink/cassandra,beobal/cassandra,instaclustr/cassandra,mshuler/cassandra,clohfink/cassandra,stef1927/cassandra,cooldoger/cassandra,krummas/cassandra,krummas/cassandra,michaelsembwever/cassandra,snazy/cassandra,driftx/cassandra,adelapena/cassandra,kgreav/cassandra,mshuler/cassandra,apache/cassandra,kgreav/cassandra,belliottsmith/cassandra,jasonstack/cassandra,pauloricardomg/cassandra,thelastpickle/cassandra,mike-tr-adamson/cassandra