dataset_names folder deleted as not feasible

style.css : home page modified to fit the expanded summary table

css files for custom modules have been modified not to underline the tab title on hover over

work in progres for GeneSetEnrichmentAnalysis (JS and Rmd files)
GeneExpressionExplorer, GeneSetEnrichment, and ImmuneResponsePredictor:
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CSS : reinstated underline on hover over for tab titles that are not active and so are active links

JS : changed the logic so that custom hover over class is only added to tab titles that are not active (and so are active links)

GeneSetEnrichment.Rmd : work in progress