cards-pane and tabbed-panes style import causes style overrides of Bootstrap card and Docsy highlight styles

[chalin]

The following PR

• #1009

introduced an override of the Bootstrap styles for .card-deck, .card, etc. through shortcodes/cards-pane.scss. This style overrides is an undesirable breaking change.

My guess is that this problem was introduced way back via:

• #532

but that it wasn't as obviously manifested until cards-pane.scss got processed along with all other Bootstrap styles (as is done in #1009).

The card-related style changes should only be applied in the context of Docsy cards and card-decks. @deining - do you agree?

Edit: this also happens for the .td-content .highlight Docsy style.

• [x] Fix style overrides for:
  • [x] card-related styles - #1157
  • [x] highlight - #1163
• [ ] Add a note to the 0.3.0 CHANGELOG entry concerning this breaking change - #1167

[chalin]

I've generalized this issue to cover tabbed-panes styles since the same unintention style override is happening for .td-content .highlight.