[wip] Create front-end functionality to endorse a post

[bnolinn]

• I have added functionality to post-menu-list.tpl to add a button to the menu list of a post. I also created a file called endorsements.js to backup this functionality
• This functionality makes progress on Create a feature to allow instructor to endorse a post #1 and the user story "As a professor, I want to be able to endorse or pin a reply so that I can highlight/showcase correct"
• Included in this is the changes I made in P1 in the file delete-posts. Those can be ignored as they have already been reviewed.
• The next step is to add automated test cases to ensure this functionality works.

[coveralls]

Pull Request Test Coverage Report for Build 13580348644

Warning: This coverage report may be inaccurate.

This pull request's base commit is no longer the HEAD commit of its target branch. This means it includes changes from outside the original pull request, including, potentially, unrelated coverage changes.

• For more information on this, see Tracking coverage changes with pull request builds.
• To avoid this issue with future PRs, see these Recommended CI Configurations.
• For a quick fix, rebase this PR at GitHub. Your next report should be accurate.

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 4 unchanged lines in 2 files lost coverage.
• Overall coverage decreased (-0.02%) to 82.666%

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Files with Coverage Reduction	New Missed Lines	%
src/meta/errors.js	1	76.74%
src/user/approval.js	3	87.61%

Totals
Change from base Build 13515417494:	-0.02%
Covered Lines:	22322
Relevant Lines:	25582

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💛 - Coveralls

[intchrkl]

Looks good