Add mini seal to Related Products

Similar to https://github.com/mozilla/foundation.mozilla.org/issues/2234

- [x] Add mini seal to categories - same size as homepage (30px)
- [x] Add gray padding around image

<img width="196" alt="image" src="https://user-images.githubusercontent.com/1068783/48739543-2be3a480-ec09-11e8-88dc-1c437fbba7c2.png">


<img width="925" alt="image" src="https://user-images.githubusercontent.com/1068783/48739470-efb04400-ec08-11e8-8dcc-8c137dbbb08d.png">


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Add mini seal to Related Products #2236

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