Marking a Response as the Best Response

[Procos12]

In this issue, we will allow anyone to mark a response to a question as the best response. This opens the door for us to limit this ability to only instructors later.

Estimated Effort:
Finding the right place to add the component in the code may be troublesome, however I do not see implementing this feature as an something difficult. I expect it to take about a week or less.
Estimated time: 5 days

Dependencies:
None

Initial assignments for team members:
Assigned to Abdulwahab Al-Rumaihi

Milestones to indicate which sprint the issue should be completed in:
This should be complete by the end of sprint 1

Acceptance criteria:
Anyone can have the ability to mark a response as the best response. We will test it on a running version of nodebb to see if this is the case. Afterwards the best response should clearly be indicated within a post.
In another issue, we will limit the ability of selecting the best response only to the instructor.

[Procos12]

Issue was too big, have to refactor into multiple other issues, will be commented on later

[Procos12]

Divided into #39, #40, #41