Add notes to First Steps and Github Issues Pages to Clarify it is OK to Move On (fixes #2554)

[johnmdrake1]

Fixes #2554

Description

I have added notes to both the "Github Issues" pages and "First Steps" pages(in the Step 6 Section) to make it clearer that Aspiring VI's can continue working on Issues and Pull requests while waiting on approval for another one. This lets them know that they can continue making progress and move on to the next step if their Pull Request has not yet been merged. Removed the words that said you must have your Step 6 PR merged before moving on. See #2554 for more discussion on this issue.

Anything else I can add to improve these changes, please allow me to know.

Checklist

[x] Check for issue number in pull request title
[x] Are there any unneeded files in the pull request?
[x] Did they make a branch for their patch?
[x] Does the pull request actually fix the issue?
[x] Check the pull request on raw.githack, does it display without any errors?
[x] Is there any merge conflicts?
[x] Make sure that people use their GitHub accounts when making commits through git

Raw.Githack preview link

https://raw.githack.com/johnmdrake1/johnmdrake1.github.io/issues-and-pr-clarification-johnmdrake1/#!pages/vi/vi-first-steps.md

https://raw.githack.com/johnmdrake1/johnmdrake1.github.io/issues-and-pr-clarification-johnmdrake1/#!pages/vi/vi-github-issues.md

[johnmdrake1]

@ChiragAwale @perryc85 This is what I have for a fix as we discussed in #2554 , thought you may want to see