Improve documentation on what is a 'custom' vs 'nf-core' configuration...

[James A. Fellows Yates]

At this question:

This tool helps you to build a custom Nextflow config file for your HPC 
based on your specified job scheduler and resources. Follow the prompts 
to specify your settings.

[?] What type of configuration would you like to build?: custom
 > custom
   nf-core

I'm not sure what the difference is between the two... is custom a 'norma' Nextflow pipeline vs nf-core?

[James A. Fellows Yates]

Also why is the 'container' question missing from nf-core (as in it's only in the custom question flow)

[Georgie Samaha]

Using infrastructure and nf-core options now. Addressed by #37