Vignette's content enhancements

[broncio123]

Some amount of editing is required in the written text and the code commands to make it more user-friendly and readable
Here's a list of suggestions

1. Some of the text may have to be rewritten,
   There seems to be a higher emphasis on introducing the statistical methodology and very little in terms of interpretation of its outputs.

2. In terms of the commands,

• Use self-descriptive variable names for input and output variables
  This could help to enhance the readability of code blocks, to emphasise the logic behind commands/functions called.
• Breakdown long function/command calls via the definition of intermediate variables
  I base this comment on my experience with Python code, for which guidance on code writing standards has been laid out https://realpython.com/python-pep8/#naming-styles

[broncio123]

applying style according to this guide
http://adv-r.had.co.nz/Style.html

[ococrook]

here are some more suggestions that I'd like to keep to: https://bioconductor.org/developers/how-to/coding-style/