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

package.json

@@ -1,7 +1,7 @@
 {
   "name": "omorphia",
   "type": "module",
-  "version": "0.6.3",
+  "version": "0.6.4",
   "files": [
     "dist"
   ],