Expand Github profile page on Graduate module to include pinning repos and profile README

[40thieves]

Which module(s) and week(s) does this change affect? Module(s): Graduate Week(s): N/A

What is the work that needs to be done?

Expand the Github profile page of the Graduate module to include some tips on pinning repos and profile READMEs.

Why is this work important to do?

Trainee's Github profiles can be cryptic to employers with no knowledge of CYF - who knows what a JavaScript-Core-1-Week1 repo is about and how much of the trainee's work does it include? Therefore we should encourage trainees to customise their Github profiles to highlight their best work (e.g. final projects).

Additional context

Who might need to know about this change?

@SallyMcGrath