Improvements to post listings (#536)

Improvements to post listings (#536)

* Improvements to post listings.

* Expanded image and body now show below the rest of the listing.
* The above are also offset to not be under the votes and thumbnail.
* Post title doesn't jump to a new line when you expand the image.
* Thumbnail doesn't disappear when you expand the image.
* Does not apply on mobile since things don't jump around as much.
* Clicking expanded image opens the original in a new tab.
* Does not apply on mobile since you can just long press.
* Instead tapping the image closes it.
* pictrs images now prefer the original format over jpg.
* Rendering split into many functions to improve readability.
* Post actions are now on the same line as the comments button.
* Post actions now show on mobile.
* Comments button made larger.
* Expanding or contracting an image now expands or contracts the body.

* Regenerated yarn.lock

To avoid problems resulting from malicous changes by the dev of `colors`