Use gifs from resources-frontend (#160)

Author: liatgo

README.md

@@ -12,14 +12,14 @@ Two optional themes are supported when using React Tree:
  Includes all the logic, based on @emotion/core - [README](https://github.com/kenshoo/react-tree/blob/master/packages/core/README.md)
 
   <p align="center">
-      <img src="/packages/core/demo.gif?raw=true" width="288" />
+      <img src="https://grid.kenshoo.com/resources-frontend/latest/react-tree/core/demo.gif" width="288"/>
   </p>
 
  #### Material tree 
  Based on the basic tree logic, using Material-UI components - [README](https://github.com/kenshoo/react-tree/blob/master/packages/material_tree/README.md)
 
   <p align="center">
-      <img src="/packages/material_tree/demo.gif?raw=true" width="288" />
+      <img src="https://grid.kenshoo.com/resources-frontend/latest/react-tree/material/demo.gif" width="288" />
   </p>
 
 Both options support component customization. <br/>

packages/core/.npmignore

@@ -1,4 +1,3 @@
 tests
 node_modules
-cc-test-reporter
-demo.gif
+cc-test-reporter

packages/core/README.md

@@ -9,7 +9,7 @@ Examples can be found - [here](https://github.com/kenshoo/react-tree/blob/master
 
 
   <p align="center">
-      <img src="demo.gif?raw=true" width="288" />
+      <img src="https://grid.kenshoo.com/resources-frontend/latest/react-tree/core/demo.gif" width="288" />
   </p>
 
   ### Installation

packages/core/demo.gif

@@ -1,4 +1,3 @@
 tests
 node_modules
-cc-test-reporter
-demo.gif
+cc-test-reporter

packages/material_tree/.npmignore

@@ -8,7 +8,7 @@ a user to display and manage a hierarchical structure of items using <b>Material
 Examples can be found - [here](https://github.com/kenshoo/react-tree/blob/master/packages/docs/stories/core.stories.js)
 
   <p align="center">
-      <img src="demo.gif?raw=true" width="288" />
+      <img src="https://grid.kenshoo.com/resources-frontend/latest/react-tree/material/demo.gif" width="288" />
   </p>
 
   ### Installation