update preview target, add fern/.preview to gitignore

Author: jsklan

.gitignore

@@ -14,3 +14,6 @@ compiled/
 
 # Rubymine
 .idea
+
+# Fern preview files
+/fern/.preview

fern/generators.yml

@@ -64,6 +64,6 @@ groups:
         version: 4.22.0
         github:
           mode: pull-request
-          repository: fern-demo/intercom-python
+          repository: fern-demo/intercom-python-sdk
         config:
           client_class_name: Intercom