Removed unused ColumnHeader component

• Removed:
- unused ColumnHeader component

app/javascript/gabsocial/components/column_header.js

@@ -1,87 +0,0 @@
-import Button from './button'
-import Heading from './heading'
-import TabBar from './tab_bar'
-
-export default class ColumnHeader extends PureComponent {
-
-  static contextTypes = {
-    router: PropTypes.object,
-  }
-
-  static propTypes = {
-    title: PropTypes.node,
-    showBackBtn: PropTypes.bool,
-    actions: PropTypes.array,
-    tabs: PropTypes.array,
-  }
-
-  historyBack = () => {
-    if (window.history && window.history.length === 1) {
-      this.context.router.history.push('/home')
-    } else {
-      this.context.router.history.goBack()
-    }
-  }
-
-  handleBackClick = () => {
-    this.historyBack()
-  }
-
-  render() {
-    const {
-      title,
-      showBackBtn,
-      tabs,
-      actions,
-    } = this.props
-
-    return (
-      <div className={[_s.default, _s.height100PC, _s.flexRow].join(' ')}>
-        {
-          showBackBtn &&
-          <Button
-            color='primary'
-            backgroundColor='none'
-            className={[_s.alignItemsCenter, _s.pl0, _s.justifyContentCenter].join(' ')}
-            icon='back'
-            iconSize='20px'
-            iconClassName={[_s.mr5, _s.fillPrimary].join(' ')}
-            onClick={this.handleBackClick}
-          />
-        }
-
-        <div className={[_s.default, _s.height100PC, _s.justifyContentCenter, _s.mr10].join(' ')}>
-          <Heading size='h1'>
-
-          </Heading>
-        </div>
-        
-        {
-          !!tabs &&
-          <TabBar tabs={tabs} />
-        }
-
-        {
-          !!actions &&
-          <div className={[_s.default, _s.bgTransparent, _s.flexRow, _s.alignItemsCenter, _s.justifyContentCenter, _s.mlAuto].join(' ')}>
-            {
-              actions.map((action, i) => (
-                <Button
-                  backgroundColor='none'
-                  color='primary'
-                  onClick={() => action.onClick()}
-                  key={`column-header-action-btn-${i}`}
-                  className={[_s.ml5, _s.px10].join(' ')}
-                  icon={action.icon}
-                  iconClassName={_s.inheritFill}
-                  iconSize='15px'
-                />
-              ))
-            }
-          </div>
-        }
-      </div>
-    )
-  }
-
-}