PLT-6905 - Updating channel header design (#6789)

* PLT-6905 - Updating channel header design

* Updating border-radius

* Updating radius for wide icons

* Updating trigger for overlay

* Updating UI for channel header

* Updating channel header sizing

* Updating channel header css

* Updating sidebar css

* Updating status icons

* Adjusting border

* Updating comment

* Removing type from status icon

* Fixing UI issues for the channel header/sidebar

* make "Add a channel description" open the channel header modal

* Updating status and opacity

* Updating stauts icon positioning

* Updating description and heading size

* Updating UI changes

* Updating UI changes

* add a focused class to the parent div .search__form and then remove when hover away

* Fix active state for pinned posts icon

* Updating UI changes

* Update channel header text

webapp/sass/utils/_mixins.scss

@@ -31,28 +31,8 @@
 // Webrtc button
 @mixin webrtc-button {
     .webrtc__button {
-        @include border-radius(50px);
-        background: $button--ready;
-        display: block;
-        height: 33px;
-        text-align: center;
-        width: 33px;
-
-        &.on,
-        &:hover {
-            background: darken($button--ready, 5%);
-        }
-
         &.offline {
-            background: $video-circle-offline;
-
-            &:hover {
-                background: $video-circle-offline;
-            }
-        }
-
-        svg {
-            fill: $white;
+            @include opacity(.5);
         }
     }
 }