Declare missing types

packages/website/ts/globals.d.ts

@@ -3,6 +3,10 @@ declare module 'whatwg-fetch';
 declare module 'thenby';
 declare module 'react-document-title';
 declare module 'react-ga';
+declare module 'reach__dialog';
+declare module 'react-flickity-component';
+declare module 'react-anchor-link-smooth-scroll';
+declare module 'react-responsive';
 
 declare module '*.json' {
     const json: any;