feat: feed feature, typescript, remove google, fix errs & warns

src/templates/shared/getDescription.ts

@@ -7,7 +7,7 @@ const extractContent = (s: string): string => {
   return s
 }
 const getDescription = (content: string): string => {
-  return extractContent(content).substr(0, 100) + '...'
+  return extractContent(content).slice(0, 100) + '...'
 }
 
 export default getDescription