Update of GH pages to remove references to SLACK

Author: Jacek Gębal

docs/_posts/2016-10-10-Version3-pre-alpha.md

@@ -12,7 +12,5 @@ Nearly every day version 3 has commits to repository with multiple developers co
 
 It won't be long until we are in an alpha status.   If your interested in following along or helping out with the project check out the [version 3 readme.md](https://github.com/utPLSQL/utPLSQL/blob/version3/readme.md)
 
-Feel free to join us in our [slack chat room](https://join.slack.com/t/utplsql/shared_invite/zt-xwm68udy-4cF_3PNEyczYEbWr38W5ww) where we communicate daily about the project.
-
 We welcome support requests and discussions, feature requests, and bug reports in the [GitHub issues log](https://github.com/utPLSQL/utPLSQL/issues).
 

docs/_posts/2017-01-17-Version3.0.0.0-Alpha1.md

@@ -11,7 +11,5 @@ It can be downloaded from the [releases page.](https://github.com/utPLSQL/utPLSQ
 
 It's being used now in multiple organizations with great success.   The documentation work is progressing.  However, we realize that quite a bit of work needs to be done in this area. 
 
-Feel free to join us in our [slack chat room](https://join.slack.com/t/utplsql/shared_invite/zt-xwm68udy-4cF_3PNEyczYEbWr38W5ww) where we communicate daily about the project.
-
 We welcome support requests and discussions, feature requests, and bug reports in the [GitHub issues log](https://github.com/utPLSQL/utPLSQL/issues).
 

docs/_posts/2017-04-01-Version3Beta1.md

@@ -12,8 +12,6 @@ It can be downloaded from the [releases page.](https://github.com/utPLSQL/utPLSQ
 
 It's being used now in multiple organizations with great success.   The documentation work is progressing.  However, we realize that quite a bit of work needs to be done in this area. 
 
-Feel free to join us in our [slack chat room](https://join.slack.com/t/utplsql/shared_invite/zt-xwm68udy-4cF_3PNEyczYEbWr38W5ww) where we communicate daily about the project.
-
 We welcome support requests and discussions, feature requests, and bug reports in the [GitHub issues log](https://github.com/utPLSQL/utPLSQL/issues).
 
 This is not an April Fools Day Joke,  we really release it.

docs/contributing.md

@@ -7,9 +7,9 @@ menuInclude: true
 
 utPLSQL project team is always willing to work with the community. 
 
-- Feel free to post [bugs or issues](https://github.com/utPLSQL/utPLSQL/issues).   We also have discussions in the issues, feel invited to post questions there.
-- Join developers the [utPLSQL team](http://utplsql-slack-invite.herokuapp.com) on [Slack](https://slack.com/).
-- [Make and submit changes](https://github.com/utPLSQL/utPLSQL/blob/master/CONTRIBUTING.md) to the code base.
+- Feel free to post [bugs or issues](https://github.com/utPLSQL/utPLSQL/issues).   
+- Look into [github discussions](https://github.com/utPLSQL/utPLSQL/discussions) to find support, ask questions and share ideas.
+- Submit changes to the code base. See the [contributing](https://github.com/utPLSQL/utPLSQL/blob/master/CONTRIBUTING.md) guide.
 
 You can find the source code for the utpsql on GitHub:
 {% include icon-github.html username="utplsql" %} 

mkdocs.yml

@@ -40,8 +40,8 @@ extra:
   social:
     - icon: fontawesome/brands/twitter
       link: https://twitter.com/utPLSQL
-    - icon: fontawesome/brands/slack
-      link: https://join.slack.com/t/utplsql/shared_invite/zt-xwm68udy-4cF_3PNEyczYEbWr38W5ww
+    - icon: fontawesome/regular/comment
+      link: https://github.com/utPLSQL/utPLSQL/discussions
     - icon: fontawesome/brands/github
       link: https://github.com/utPLSQL
     - icon: fontawesome/solid/envelope