Made the Pinned Reply move to the top (refresh does not preserve)

[ChristinaTrinh]

• I added a backend logic to make Pinned Reply move to the top.
• However, I have not made any API calls, therefore, when refreshing the page, it will NOT stay as it is supposed to. This involves much more work so will be done later. The following tasks need to be done to make the changes preserved after refreshing page:
  + Add a 'pinned' field to the database schema for posts: I have not figured how to do this but I spent hours on looking for example with the Bookmark Post feature.
  + Create API endpoints to handle pinning and unpinning: this looks like it's involving like 15+ files so it's not doable for this sprint.
  + Adjust frontend to send requests to these endpoints when posts are pinned/unpinned
• I tested the changes locally.

[coveralls]

Pull Request Test Coverage Report for Build 13223159975

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 1 unchanged line in 1 file lost coverage.
• Overall coverage decreased (-0.005%) to 82.666%

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Files with Coverage Reduction	New Missed Lines	%
src/meta/errors.js	1	76.74%

Totals
Change from base Build 13222395496:	-0.005%
Covered Lines:	22322
Relevant Lines:	25582

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💛 - Coveralls