Update slack link with correct url
Update slack link with correct url

dlabrecq/patternfly-toolkit,kybaker/patternfly-org,dlabrecq/patternfly-org,dlabrecq/patternfly-toolkit,kybaker/patternfly-org,dlabrecq/patternfly-toolkit,bleathem/patternfly-org,dlabrecq/patternfly-org,kybaker/patternfly-org,bleathem/patternfly-org,dlabrecq/patternfly-org,bleathem/patternfly-org,bleathem/patternfly-org,kybaker/patternfly-org,dlabrecq/patternfly-org,patternfly/patternfly-org,dlabrecq/patternfly-toolkit