Colors of post-cards

We have added an easy way to add the color of post-cards. You can choose a color from the color palette.

1. To add the color, just add an adequate internal tag in Post settings panel to the published post.
2. For example, add an internal tag #blue (tags which are prefixed by a # character, are internal tags within Ghost).
3. Click Update, to activate.

The tag slug should be hash-colorname, for example hash-blue