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/components/user_settings/custom_theme_chooser.jsx

@@ -295,6 +295,7 @@ class CustomThemeChooser extends React.Component {
                                 {codeThemeOptions}
                             </select>
                             <OverlayTrigger
+                                trigger={['hover', 'focus']}
                                 placement='top'
                                 overlay={popoverContent}
                                 ref='headerOverlay'