FIX: Update README.md (#7)

Fix image path in "Images" section of docs

README.md

@@ -63,7 +63,7 @@ How to develop themes:
 Images (e.g. screenshots) for docs can be stored in the `/assets` directory. To reference them from the markdown, use the standard markdown image syntax, with a path like `/assets/my-image.png`. For example:
 
 ```
-![some alt text](/assets/images/my-image.png)
+![some alt text](/assets/my-image.png)
 ```
 
 The sync tool will automatically upload the images to Discourse, and replace the path with a discourse-specific `upload://` path. A mapping of repo-path to discourse-path will be persisted in an HTML comment at the end of the doc's topic.
@@ -125,4 +125,4 @@ When working on substantial changes, you may like to set up a staging environmen
  ```
  For debugging, the script accepts a `-v` flag.
 
-5. Once the script has completed the first run, all the topics should be visible in Discourse. Any edits to markdown files will be synced instantaneously to Discourse.
+5. Once the script has completed the first run, all the topics should be visible in Discourse. Any edits to markdown files will be synced instantaneously to Discourse.