fix: Export Avatar, Collapse and Accordion components

src/Avatar/index.js

@@ -0,0 +1 @@
+export { default } from './Avatar';

src/index.js

@@ -1,9 +1,12 @@
+export Accordion from './Accordion';
 export Alert from './Alert';
+export Avatar from './Avatar';
 export Box from './Box';
 export Button from './Button';
 export Card from './Card';
 export Checkbox from './Form/Checkbox';
 export CheckboxGroup from './Form/CheckboxGroup';
+export Collapse from './Collapse';
 export Column from './Grid/Column';
 export Container from './Grid/Container';
 export Dropdown from './Dropdown';