Add support for the mobile version of web Twitter

[ravicious]

The mobile web Twitter uses React and some kind of a CSS-in-JS solution, which means there are no easily identifiable classes or attributes that we could use to block the activity tweets.

However, they use a certain SVG objects to represent the heart ("Foo liked") and the person silhouette ("Foo recently followed") tweets. We could use this piece of data along with the :has pseudo-class to remove the unwanted tweets.

Unfortunately, :has is in Selectors Level 4 working draft and at the moment none of the popular browsers support it.