Add SciolyFF Converter

[tctree333]

This PR adds the SciolyFF converter to the main Duosmium site.

This is a JS rewrite of csv-to-sciolyff (live).

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[tctree333]

TODO:

• [x] Error handling/display
• [x] Download button
• [x] iframe in preview page
• [x] window communication for preview page