Reactions API: Delete reaction

[joshpuetz]

Reactions API requirements: https://docs.google.com/document/d/1O8YG8moIMUHi5_A-VHVWDmdIaYeHFEpeBEFGRyxc-PQ/edit#bookmark=id.z6jwzd5e5y70

Description: create an endpoint for deleting a Reaction.

Authorization: api key

Permissions: limited to users with Admin or Super Admin role

Path: DELETE /api/reactions/:id

Body params: none

Return body: none

Return codes: 204 No Content 401 Unauthorized 403 Forbidden 404 Not Found 429 Too Many Requests

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[Ridhwana]

Based on this conversation and this one we've decided to not implement the "Delete" action, and instead just have the "Create" action change to POST to /reactions/toggle. This covers both a create and delete together.