This removes the old base button style which was a blue button and
kills the unnecessary .white class which was essentially just acting as
the new button base.
This then removes all references throughout the settings/subscriptions
pages to those button styles.
This also fixes the strange button styles that changed the :hover and
:active opacity to 0.05 which led to unpredictable results on various
backgrounds.
The data-name attribute in this case allows for a particular settings
section element to show up when the appropriate sidebar category is
clicked (which will have the same value in the data-section key).