docs: move api and cli docs routes to reference/ (#14241)

docs/reference/api/authentication.md

@@ -0,0 +1,14 @@
+# Authentication
+
+Long-lived tokens can be generated to perform actions on behalf of your user account:
+
+```shell
+coder tokens create
+```
+
+You can use tokens with the Coder's REST API using the `Coder-Session-Token` HTTP header.
+
+```console
+curl 'http://coder-server:8080/api/v2/workspaces' \
+  -H 'Coder-Session-Token: *****'
+```