MOD-349 Contextual Uploads for MD Editor (#119)

* Migrate DropArea to composition

* remove hardcoded button styling

* let markdown editor call for image upload

* allow for local testing in the docs

* validate url on set

* add chips to modal with correct defaults

* update docs to show example url doesn't load

* Bump version 0.6.4

lib/assets/styles/defaults.scss

@@ -47,6 +47,7 @@ input[type='url'],
 input[type='number'],
 input[type='password'],
 textarea,
+.input-text-inherit,
 .cm-content {
   border-radius: var(--radius-md);
   box-sizing: border-box;
@@ -146,7 +147,7 @@ input[type='number'] {
     opacity: 0.6;
   }
 
-  .btn {
+  .r-btn {
     @extend .transparent, .icon-only;
 
     position: absolute;