Revert "docs: Change console to shell and remove unused elements (#5960)" (#5964)

This reverts commit 61dcf643e8.

docs/api/authentication.md

@@ -2,13 +2,13 @@
 
 Long-lived tokens can be generated to perform actions on behalf of your user account:
 
-```shell
+```console
 coder tokens create
 ```
 
 You can use tokens with the Coder's REST API using the `Coder-Session-Token` HTTP header.
 
-```shell
+```console
 curl 'http://coder-server:8080/api/v2/workspaces' \
   -H 'Coder-Session-Token: *****'
 ```