Fix DOI to QS generation on DOI 404 page

[larsgw]

Description

• Bypass the DOI detection system of Citation.js to always attempt to query the route parameter as a DOI. E.g. https://scholia.toolforge.org/doi/10.1021/ci040131+
• Same DOI: makes sure HTML cannot be injected, even if it's just <i>
• Do not pollute the c variable in the global scope

Checklist

• [x] I have commented my code, particularly in hard-to-understand areas
• [x] My changes generate no new warnings
• [x] I have not used code from external sources without attribution
• [x] I have considered accessibility in my implementation
• [x] There are no remaining debug statements (print, console.log, ...)