Add .gitignore and update config.example.yml

Ignore __pycache__ and the local config.yml generated from the example.

.gitignore

@@ -0,0 +1,4 @@
+__pycache__/
+*.pyc
+# Local config generated from config.example.yml
+config.yml

config.example.yml

@@ -44,11 +44,11 @@ apps:
   #     optional_uses_libs: []     # Cromite manages its own deps
 
   # ── Material Files (file manager) ─────────────────────────────────────────
-  - name: MaterialFiles
-    source:
-      type: fdroid
-      repo: https://www.f-droid.org/repo
-      package_id: me.zhanghai.android.files
+  #- name: MaterialFiles
+  #  source:
+  #    type: fdroid
+  #    repo: https://www.f-droid.org/repo
+  #    package_id: me.zhanghai.android.files
 
   # ── Example: privileged system app with a prop ────────────────────────────
   # - name: MyPrivilegedApp