Temporarily remove DisGeNET integration

Supplying the custom background results in internal server errors on the
DisGeNET backend. We don't want to present results without a proper
background set.

R/ui.R

@@ -101,13 +101,6 @@ ui <- function(options) {
                   style = "margin-top: 16px",
                   DT::DTOutput("gost_details")
                 )
-              ),
-              tabPanel(
-                title = "DisGeNET",
-                div(
-                  style = "margin-top: 16px",
-                  DT::DTOutput("disgenet")
-                )
               )
             )
           )