Preparing for stable release

The theme looks better on smaller devices

Media entity 8.x-1.0
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Update notes:

We started depending on the Entity API module. In order for update to go smoothly please make sure that the Entity API >= 8.x-1.0-alpha3 is installed before updating Media entity.

Media entity Instagram 8.x-1.0
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- #2665916 by slashrsm: Implement MediaTypeInterface::getDefaultThumbnail().

Media entity Twitter 8.x-1.0
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- #2675244 by Jaesin, Dragan Eror: Simplify Tweet display JS by relying on API provided by Twitter.
- #2665920 by slashrsm: Implement MediaTypeInterface::getDefaultThumbnail().

Media entity slideshow 8.x-1.0
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- #2665918 by slashrsm: Implement MediaTypeInterface::getDefaultThumbnail().