screenshot and doc changes

Author: physik932

README.md

@@ -66,7 +66,7 @@ To configure the URL buttons, you must supply a JSON array of URLs with `title`
 
 This will yield the following display:
 
-![social_media_sites](./assets/screenshot-0.png)
+![social_media_sites](./src/images/screenshot-0.png)
 
 ### Using Zendesk Object Properties
 
@@ -104,7 +104,7 @@ This generates the following button:
 
 We can highlight this button and see the following URL:
 
-![screenshot](./assets/screenshot-1.png)
+![screenshot](./src/images/screenshot-1.png)
 
 ### Using Custom Fields in URLs
 
@@ -123,8 +123,7 @@ For example, let's say we use the custom field for the customer like `Issue Topi
 
 Given an issue type of "new feature", this would generate a URL with the values set:
 
-![customer_related_issues](./assets/screenshot-2.png)
-![customer_related_issues_url](./assets/screenshot-3.png)
+![customer_related_issues](./src/images/screenshot-2.png)
 
 An important note here is that URLs generated by custom fields are not updated dynamically.  If the custom field is on the Agent side for example and is updated, the page will need to be refreshed to update the URLs.