Fix:OER Evidence Hub

Accessibility and usability enhancements for the OER Evidence Hub and LACE learning analytics research sites, including the SVG map bits, Sankey diagrams, and so on.

Note, the SVG here is a lot more amenable to fixes than the HTML5 canvas + SVG on PhET simulations.

Developer: Martin Hawksey linkedin.com:in/mhawksey, twitter.com:mhawksey.

JuxtaLearn fixes moved to: Fix:JuxtaLearn.

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