Pull request: beta client squashed

Merge in DNS/adguard-home from beta-client-2 to master

Squashed commit of the following:

commit b2640cc49a6c5484d730b534dcf5a8013d7fa478
Merge: 659def862 aef4659e9
Author: Eugene Burkov <e.burkov@adguard.com>
Date:   Tue Dec 29 19:23:09 2020 +0300

    Merge branch 'master' into beta-client-2

commit 659def8626467949c35b7a6a0c99ffafb07b4385
Author: Eugene Burkov <e.burkov@adguard.com>
Date:   Tue Dec 29 17:25:14 2020 +0300

    all: upgrade github actions node version

commit b4b8cf8dd75672e9155da5d111ac66e8f5ba1535
Author: Vladislav Abdulmyanov <v.abdulmyanov@adguard.com>
Date:   Tue Dec 29 16:57:14 2020 +0300

    all: beta client squashed

client2/src/main.pcss

@@ -0,0 +1,33 @@
+:root {
+     /*GRAYSCALE*/
+     --white: #ffffff;
+     --gray100: #f3f3f3;
+     --gray300: #d8d8d8;
+     --gray400: #a4a4a4;
+     --gray700: #888888;
+     --gray900: #4d4d4d;
+     --black: #131313;
+     /*FEEDBACK*/
+     --red400: #c23814;
+     --orange400: #eb9300;
+     /*BRAND*/
+     --green400: #67b279;
+     --green700: #4d995f;
+     /*ADDITIONAL*/
+     --purple400: #b267a0;
+     --purple700: #994d87;
+     --slateblue400: #677bb2;
+     --slateblue700: #4d6199;
+     /*VPN*/
+     --vpngreen400: #74a352;
+     --vpngreen700: #568040;
+     --vpnslateblue700: #575770;
+     --vpnslateblue800: #464558;
+     --vpnseagreen: #5eb0b7;
+
+}
+
+body {
+     font-size: 14px;
+     color: var(--gray900);
+}