remove superfluous deps, update yarn.lock

package.json

@@ -100,11 +100,7 @@
     "classnames": "^2.2.5",
     "dateformat": "^1.0.12",
     "deep-equal": "^1.0.1",
-    "deepmerge": "^1.5.0",
     "fuzzy": "^0.1.1",
-    "hast-util-from-string": "^1.0.0",
-    "hast-util-sanitize": "^1.1.1",
-    "hast-util-to-mdast": "^1.2.0",
     "history": "^2.1.2",
     "immutability-helper": "^2.0.0",
     "immutable": "^3.7.6",
@@ -114,7 +110,6 @@
     "jwt-decode": "^2.1.0",
     "localforage": "^1.4.2",
     "lodash": "^4.13.1",
-    "markup-it": "^2.0.0",
     "material-design-icons": "^3.0.1",
     "mdast-util-definitions": "^1.2.2",
     "mdast-util-to-string": "^1.0.4",
@@ -151,29 +146,19 @@
     "redux-notifications": "^2.1.1",
     "redux-optimist": "^0.0.2",
     "redux-thunk": "^1.0.3",
-    "rehype-minify-whitespace": "^2.0.0",
     "rehype-parse": "^3.1.0",
-    "rehype-raw": "^1.0.0",
-    "rehype-react": "^3.0.0",
     "rehype-remark": "^2.0.0",
-    "rehype-sanitize": "^2.0.0",
     "rehype-stringify": "^3.0.0",
-    "remark-html": "^6.0.0",
     "remark-parse": "^3.0.1",
     "remark-rehype": "^2.0.0",
     "remark-stringify": "^3.0.1",
-    "selection-position": "^1.0.0",
     "semaphore": "^1.0.5",
-    "slate": "^0.20.6",
-    "slate-drop-or-paste-images": "^0.2.0",
+    "slate": "^0.21.0",
     "slate-edit-list": "^0.7.1",
     "slate-edit-table": "^0.10.1",
     "slug": "^0.9.1",
-    "textarea-caret-position": "^0.1.1",
     "unified": "^6.1.4",
     "unist-builder": "^1.0.2",
-    "unist-util-map": "^1.0.3",
-    "unist-util-modify-children": "^1.1.1",
     "uuid": "^2.0.3",
     "whatwg-fetch": "^1.0.0"
   },

src/components/Widgets/Markdown/serializers/remarkSlate.js

@@ -1,6 +1,5 @@
 import { get, isEmpty, isArray } from 'lodash';
 import u from 'unist-builder';
-import modifyChildren from 'unist-util-modify-children';
 
 /**
  * Map of MDAST node types to Slate node types.