Merge branch 'develop' into refactor/notification_settings

CHANGELOG.md

docs/USER_GUIDE.md

docs/index.md

package.json

src/App.js

src/App.scss

src/App.vue

src/_variables.scss

src/boot/after_store.js

src/boot/routes.js

src/components/account_actions/account_actions.js

src/components/account_actions/account_actions.vue

src/components/attachment/attachment.js

src/components/attachment/attachment.vue

src/components/bookmark_timeline/bookmark_timeline.js

src/components/bookmark_timeline/bookmark_timeline.vue

src/components/chat/chat.js

src/components/chat/chat.scss

src/components/chat/chat.vue

src/components/chat/chat_layout_utils.js