Citation isn’t responsive

[JasonLo]

Fixes #50

[JasonLo]

• Added a button that allows users to easily copy bibtex citations with just one click.
• implemented a <pre> container to prevent any text overflow issues.

[cranmer]

Hmm... I don't see the copy button, or any line breaks between the different fields of the bibtex. http://simulation-based-inference.org/uncategorized/2022/12/31/uncovering-dark-matter-density-profiles-in-dwarf-galaxies-with-s/