Large update for all components

reorganization, linting, updating file imports, consolidation
warning: there will be errors in this commit
todo: update webpack, add missing styles, scss files, consolidate the rest of components within features/*

app/javascript/gabsocial/components/column_subheading/column_subheading.js

@@ -0,0 +1,17 @@
+import './column_subheading.scss';
+
+export default class ColumnSubheading extends PureComponent {
+  static propTypes = {
+    text: PropTypes.string.isRequired,
+  };
+
+  render() {
+    const { text } = this.props;
+
+    return (
+      <div className='column-subheading'>
+        {text}
+      </div>
+    );
+  }
+};

app/javascript/gabsocial/components/column_subheading/column_subheading.scss

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+.column-subheading {
+  background: $ui-base-color;
+  color: $dark-text-color;
+  padding: 8px 20px;
+  font-size: 12px;
+  font-weight: 500;
+  text-transform: uppercase;
+  cursor: default;
+}

app/javascript/gabsocial/components/column_subheading/index.js

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+export { default } from './column_subheading';