Functions to build data dashboard and interactive plots

[abearab]

• draft a module called dashboard
• comment codes and include this module in the ReadTheDocs files

Plots related to #20

• rho volcano plot
• gamma volcano plot
• rho vs gamma scatter plot

[abearab]

e.g. https://wormlabcaltech.github.io/Angeles_Leighton_2016/RNASeqAnalysis.html