docs: reference main.json instead of renovate.json

Author: raisedadead

README.md

@@ -1,7 +1,7 @@
 > Our organizational level renovate configs
 
 When we onboard a new repository with `renovate` it will use the default config
-(`default.json`) that essentially ships some sane defaults from `renovate.json`.
+(`default.json`) that essentially ships some sane defaults from `main.json`.
 
 By default, once the repo has been onboarded, the renovate config looks like
 this: