Webvysor
webvysor, fix backend error (#7) * add webvisor * remove ya metrica in dev env * disable calc button if there is only one person * remove unused code * add tests * #6 fix backend error * fix #6
webvysor, fix backend error (#7) * add webvisor * remove ya metrica in dev env * disable calc button if there is only one person * remove unused code * add tests * #6 fix backend error * fix #6