Consistent interaction flow for default pdf.js within-document links (like for figures and equations)

As part of earlier changes (#55), we made the style of links added by hyperref consistent with the links added to papers by the scholar-reader pipeline.

However, while the appearance is the same, the behavior is different. The interaction flow for the entities we highlight is (click -> tooltip -> click on action -> take action). The interaction flow for hyperref links is (click -> take action), which can be jarring.

Once we're more certain what the ideal interactions look like for citations and symbols, we should update the interactions for the hyperref links to give them a consistent interaction flow.