docs: rearrange and link spotify tutorial (#472)

* Rearrange existing tutorials alphabetically
* link Spotify tutorial

Author: odysseusmax

docs/examples/examples.rst

@@ -5,12 +5,13 @@ Examples
    :maxdepth: 2
 
    bitbucket
-   github
-   google
    facebook
    fitbit
+   github
+   google
    linkedin
    outlook
+   spotify
    tumblr
    real_world_example
    real_world_example_with_refresh