Remove graph on "Summary" tab displaying proportions

[crtahlin]

From email by Lara: zivjo, mislim, da smo ga zeleli dati ven - saj ga je nadomestil graf iz durgega zavihka

This is the graph:

Remove:

• the code generating the graph in Server.R
• the code rendering the graph in Ui.R
• the description for this plot in PlotSympotomsGenerateDescription.R