Closes#4026.
Squashed commit of the following:
commit bcd1315a10e819daee3aee323427d90a27860b4a
Author: Ainar Garipov <A.Garipov@AdGuard.COM>
Date: Tue Jan 18 14:57:49 2022 +0300
openapi: fix example
commit b56e27c5ac1fc7c3f595057d77607479d72ec50a
Author: Ildar Kamalov <ik@adguard.com>
Date: Tue Jan 18 14:55:51 2022 +0300
client: show version on install page
commit 95dfbfaa1235deef7b55e51457d11c677f6ef6b5
Author: Ainar Garipov <A.Garipov@AdGuard.COM>
Date: Tue Jan 18 14:29:08 2022 +0300
home: show version in install api