Update README.md

Remove link to old slack, and rephrase things a bit.

Author: lcarva

profile/README.md

@@ -1,3 +1,3 @@
-Contact the Enterprise Contract team at
-[`#forum-stonesoup-contract` in the CoreOS Slack](https://coreos.slack.com/archives/C031J4KBFME).
-Read [the documentation](https://enterprisecontract.dev).
+Engage with the Enterprise Contract team by filing an issue in one of the repositories in this GitHub organization.
+
+Our [documentation](https://enterprisecontract.dev) may already have the answer you are looking for.