feat: enable docker-compose by default

Flips Docker Compose config from default disabled to default enabled.

lib/config/definitions.js

@@ -879,7 +879,7 @@ const options = [
     stage: 'repository',
     type: 'json',
     default: {
-      enabled: false,
+      enabled: true,
     },
   },
   {

website/docs/_posts/2017-10-05-configuration-options.md

@@ -252,9 +252,9 @@ Configuration specific for Dockerfile updates.
 Configuration object for Docker Compose yaml file renovation. Also inherits settings from `docker` object.
 
 | name    | value             |
-| ------- | ------------------ |
+| ------- | ----------------- |
 | type    | object            |
-| default | { enabled: false } |
+| default | { enabled: true } |
 
 ## enabled