Add DM conversations mode similar to upstream

app/javascript/flavours/glitch/features/direct_timeline/containers/conversation_container.js

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+import { connect } from 'react-redux';
+import Conversation from '../components/conversation';
+import { markConversationRead } from '../../../actions/conversations';
+
+const mapStateToProps = (state, { conversationId }) => {
+  const conversation = state.getIn(['conversations', 'items']).find(x => x.get('id') === conversationId);
+
+  return {
+    accounts: conversation.get('accounts').map(accountId => state.getIn(['accounts', accountId], null)),
+    unread: conversation.get('unread'),
+    lastStatusId: conversation.get('last_status', null),
+  };
+};
+
+const mapDispatchToProps = (dispatch, { conversationId }) => ({
+  markRead: () => dispatch(markConversationRead(conversationId)),
+});
+
+export default connect(mapStateToProps, mapDispatchToProps)(Conversation);

app/javascript/flavours/glitch/features/direct_timeline/containers/conversations_list_container.js

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+import { connect } from 'react-redux';
+import ConversationsList from '../components/conversations_list';
+import { expandConversations } from 'flavours/glitch/actions/conversations';
+
+const mapStateToProps = state => ({
+  conversations: state.getIn(['conversations', 'items']),
+  isLoading: state.getIn(['conversations', 'isLoading'], true),
+  hasMore: state.getIn(['conversations', 'hasMore'], false),
+});
+
+const mapDispatchToProps = dispatch => ({
+  onLoadMore: maxId => dispatch(expandConversations({ maxId })),
+});
+
+export default connect(mapStateToProps, mapDispatchToProps)(ConversationsList);