Improves the look of buttons.

Signed-off-by: Lee Sheng <lsheng@wibidata.com>
Adds a followup section to the music recommendation tutorial.

Signed-off-by: Lee Sheng <lsheng@wibidata.com>
Add rake preview to prevent analytics inflation.

By default Google Analytics is enabled in the _config.yml which
results in all the testing work going into the analytics stream.
So we're adding a simple script that disables Google Analytics,
runs Jekyll, and then re-enables Google Analytics.

Signed-off-by: Juliet Hougland <juliet@wibidata.com>
Adds maintaining docs section to the README.md