when editing the issue's description sent the html of it to the SSE server
    
    Then in the JS we can display the nice version of the issue's
    description live, instead of having to reload the page to see the
    markdown rendered.
    
    Fixes https://pagure.io/pagure/issue/5039
    
    Signed-off-by: Pierre-Yves Chibon <pingou@pingoured.fr>