Minor issues detected during testing

[pverscha]

During testing of the application with some example data, we stumbled upon this small list of minor issues:

• Loading example files on Windows causes all the data to be shown on one line
• Cite references for the example data that's provided on the website
• Move options "advanced analysis" above "pathway analysis window"
• When hovering over a node in the visualization, the tooltip also enlarges when you zoom in (this should stay the same size ideally)
• When hovering over a node in the visualization (and the differencial abundance view is enabled) the tooltips should ideally show one number (the number that's also used for the color of the scale).