Document workflow of tool with not-just-microbiome datasets

[fedarko]

I imagine this would work best as a separate tutorial (analogous to the moving pictures one), but using Qurro standalone instead of through QIIME 2. Depending on where we get the data from, we could cover:

1. Wrangling arbitrary data into the types accepted by Qurro (BIOM table, tab-separated metadata files, ALDEx2 / DEseq2 / ... output)
2. Running Qurro
3. Interpreting results (e.g. what columns in the ALDEx2 / DEseq2 / ... output should be used in the visualization) -- likely ties in with If an "Intercept" column exists, don't start in it by default #229

Update: progress --

• RNA-seq tutorial (Add ALDEx2 transcriptomics tutorial #279)
• Color composition tutorial (Add conversion tutorial #282)

[fedarko]

closed now that #282 merged in