new rewrite for academy link in yaml

Author: emeliawilkinson24

docs.yaml

@@ -38,7 +38,6 @@ nanoc_config:
         - '^https?://travis-ci.org/*'
         - '^https?://ci.appveyor.com/*'
         - 'https://twitter.com/datastax'
-        - 'https://academy.datastax.com/slack'
         - 'http://sourceforge.net/projects/boost/files/boost-binaries/1.[0-9]+.0/boost_1_[0-9]+_0-msvc-[0-9]+.[0-9]+-(64|32).exe/download'
 rewrites:
   - http://datastax.github.io/cpp-driver/: /
@@ -69,6 +68,8 @@ rewrites:
   - https://github.com/datastax/cpp-driver/blob/master/vc_build.bat: https://github.com/datastax/cpp-driver/blob/2.14.0/vc_build.bat
   - search: 'https://community.datastax.com/index.html'
     replace: 'https://cassandra.apache.org/_/community.html'
+  - search: 'https://academy.datastax.com/slack'
+    replace: 'https://dtsx.io/discord'
 rules:
   use_path_nav_files_only: true