Trello Block - Expand supported Label colors

[Dan-Peck]

The "Light" and "Dark" versions of selectable label colors in the Trello UI do not carry over into DAKboard. Instead, those labels are presented with no background at all.

Researching this, it was discovered that the Trello API documentation states that only 10 color names are valid.
Reference: https://developer.atlassian.com/cloud/trello/rest/api-group-labels/

Although it is an un-documented feature, the response Trello API sends to us does actually include color names such as pink_light and pink_dark. We can utilize these to adding mappings to an expanded set of colors for them.

Here are the swatches from Trello's UI:

[Dan-Peck]

Merged in @ 4d87822 and added to the queue for upcoming release to the live site.