feat(media): add external media library support, Uploadcare integration (#1602)

dev-test/config.yml

@@ -2,9 +2,9 @@ backend:
   name: test-repo
 
 display_url: https://example.com
-media_folder: "assets/uploads"
 
 publish_mode: editorial_workflow
+media_folder: assets/uploads
 
 collections: # A list of collections the CMS should be able to edit
   - name: "posts" # Used in routes, ie.: /admin/collections/:slug/edit
@@ -19,7 +19,12 @@ collections: # A list of collections the CMS should be able to edit
     fields: # The fields each document in this collection have
       - {label: "Title", name: "title", widget: "string", tagname: "h1"}
       - {label: "Publish Date", name: "date", widget: "datetime", format: "YYYY-MM-DD hh:mma"}
-      - {label: "Cover Image", name: "image", widget: "image", required: false, tagname: ""}
+      - label: "Cover Image"
+        name: "image"
+        widget: "image"
+        required: false
+        tagname: ""
+
       - {label: "Body", name: "body", widget: "markdown", hint: "Main content goes here."}
     meta:
       - {label: "SEO Description", name: "description", widget: "text"}