fix(workflow): docs link

Author: duanhongyi

src/quickstart/deploy-an-app.md

@@ -107,5 +107,5 @@ There is a lot more you can do with Drycc Workflow, play around with the CLI:
     * [drycc/ruby-getting-started](https://github.com/drycc/ruby-getting-started)
     * [drycc/python-getting-started](https://github.com/drycc/python-getting-started)
     * [drycc/php-getting-started](https://github.com/drycc/php-getting-started)
-* Read about using application [Buildpacks](../applications/using-buildpacks) or [Dockerfiles](../applications/using-dockerfiles.md)
-* Join our [#community slack channel](https://slack.drycc.cc) and meet the team!
+* Read about using application [Buildpacks](../applications/using-buildpacks.md) or [Dockerfiles](../applications/using-dockerfiles.md)
+* Join our [#community slack channel](https://drycc.slack.com/) and meet the team!

themes/drycc/topbar.html

@@ -12,7 +12,7 @@ <h1><a href="/" class="logo"><img src="{{ base_url }}/static/img/svg/logo.svg" w
               <a class="dropdown" data-dropdown="drop2" aria-controls="drop1" aria-expanded="false">Projects <em><i class="fa fa-caret-down"></i></em></a>
             </li>
             <li>
-              <a href="https://join.slack.com/t/drycc/shared_invite/enQtNTUwNjc3MjE0OTMwLTdhODdlMTk0YWQ1ZjdiYmZlZjZjNDU2ZWE0OTBlZTA5NjMxNjFkNjQyNDMzYzVkNjJjYTU4ZjZkZWQ0MzYxNzE" id="header-slack" class="item" title="Slack">Slack</a>
+              <a href="https://drycc.slack.com/" id="header-slack" class="item" title="Slack">Slack</a>
             </li>
             <li>
               <a href="https://drycc.github.io/blog/" id="header-blog" class="item" title="Blog">Blog</a>