README: Link to issue galaxyproject#748 (hot reloader bug).

README.md

@@ -27,7 +27,7 @@ Then you can build the site in development mode to run it in a local server (at
 $ yarn develop
 ```
 This command includes a hot reloader which will update the site automatically each time you edit a file.  
-Note: There's a known issue that can occur when you're renaming/moving/deleting directories or image files. If you're finding the development server crashes too often, try adding the arguments `--resource copy` to the `yarn develop` command. This fixes the issue, at the cost of a far larger build directory (because all images are copied to it instead of linked).
+Note: There's a [known issue](https://github.com/galaxyproject/galaxy-hub/issues/748) that can occur when you're renaming/moving/deleting directories or image files. If you're finding the development server crashes too often, try adding the arguments `--resource copy` to the `yarn develop` command. This fixes the issue, at the cost of a far larger build directory (because all images are copied to it instead of linked).
 
 To generate the static files for the entire site, just run `build` instead:
 ```sh