Update Documentation

[LeaSeep]

Update big documentation as final step

• pre-processing (incl. desicion tree how to choose pre-preocessing technique)

[PaulJonasJost]

• FAQs (the app is displaying disconnected behavior such as, checking the internet connection, changing a browser (tested on Chrome and Mirror) and to mitigate common issues with web-services in general.)
• R-Code Download
• Batch Correction helpful
• Preprocessing: Interpret results
• Helpfile Preprocessing: Filtering to be specific

[LeaSeep]

• double check if "The not-passing of the test data was intended and designed to highlight allowed but potential issues in datasets" was not fixed by accident
• VI explain diff of optional and required chekcs
• PCA analysis first to identify potential batch effects by coloring metadata
• add quick link of 'Show me an analysis workflow' -> showcase A
• We placed a link now already at the Welcome tab of cOmicArt to increase its visibility to the user.