Update basic.md and basic.html to take into account showcase feature

[andrewdempsey2018]

basic.md and basic.html need to be updated to incorporate the new 'showcase' feature. These files suggest the user add the following:

{
    "name": "your_name_or_alias",
    "course_start": "year_of_course_start",
    "course_stage": "student_alum_staff_mentor",
    "favorite_language": "favorite_language",
    "currently_learning": "latest_learning"
}

However, the text should include the showcase:

"showcase": true key/value pair

and should read more like:

{
    "name": "your_name_or_alias",
    "course_start": "year_of_course_start",
    "course_stage": "student_alum_staff_mentor",
    "favorite_language": "favorite_language",
    "currently_learning": "latest_learning",
    "showcase": true
}

The relevant screenshots should be updated also

[MuzhdaN]

Hello,
If this issue is still open, can I work on it?

[auxfuse]

@MuzhdaN we actually might not need this Issue 😄 I'm working on something currently to sort this automatically 😉 Thanks for contributing to the project, and the overall conversation of it too. Why don't you create a custom creation following along to the intermediate.md guide?

[MuzhdaN]

@auxfuse thank you.
Yes, I want to work on that as well. Somehow the first PR for basic.md should be accepted to be able to continue working with the intermediate.md guide.