Pull request: home: show version in install api

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

openapi/openapi.yaml

@@ -1264,7 +1264,7 @@
           'type': 'boolean'
         'version':
           'type': 'string'
-          'example': '0.1'
+          'example': 'v0.123.4'
         'language':
           'type': 'string'
           'example': 'en'
@@ -2221,19 +2221,23 @@
       'description': 'AdGuard Home addresses configuration'
       'required':
       - 'dns_port'
-      - 'web_port'
       - 'interfaces'
+      - 'version'
+      - 'web_port'
       'properties':
         'dns_port':
           'type': 'integer'
           'format': 'uint16'
           'example': 53
+        'interfaces':
+          '$ref': '#/components/schemas/NetInterfaces'
+        'version':
+          'type': 'string'
+          'example': 'v0.123.4'
         'web_port':
           'type': 'integer'
           'format': 'uint16'
           'example': 80
-        'interfaces':
-          '$ref': '#/components/schemas/NetInterfaces'
     'AddressesInfoBeta':
       'type': 'object'
       'description': 'AdGuard Home addresses configuration'