Record the result of a Helium Release Proposal community vote. Updates the HRP status to Approved (or back to Proposed if the vote failed), adds the vote URL, and updates the README with the result. Use when the user says "the vote passed", "record the vote result", "close the vote", "the vote is done", "update the HRP with the vote result", or mentions a heliumvote.com URL for an HRP. Also handles cancelling a vote that never started (reverting Frozen back to Proposed).