phase out dependency on fancybox

[zhouji2013]

fancybox is a UI library used in a few scenarios in dashboard. Its latest version stopped having an open-source license (https://fancyapps.com/docs/ui/fancybox/). Although the version currently used in dashboard (v3) is still open source, to avoid license complexity, we should phase out dependency on this library. All usages are noncritical:

1. video popup
2. help popup
3. evidence image
4. cytoscape in Observation view
5. compound image in Compound view
6. MRA view
7. compound view in Explore view
8. cytoscape in CNKB result