chore: fix tsconfig

Author: QingWei-Li

additional.d.ts

@@ -0,0 +1,9 @@
+declare module 'react-split'
+
+declare module 'remove-markdown'
+
+declare module 'outline-icons'
+
+declare module '@headwayapp/react-widget'
+
+declare module 'markdown-link-extractor'

tsconfig.json

@@ -20,5 +20,5 @@
     "baseUrl": "."
   },
   "exclude": ["node_modules"],
-  "include": ["**/*.ts", "**/*.tsx"]
+  "include": ["**/*.ts", "**/*.tsx", "additional.d.ts"]
 }