fix: cors errors on images from github repos (#2000)

script/readmes.js

@@ -106,10 +106,10 @@ function cleanReadme(readme, defaultBranch, app) {
       `${app.slug}: updating ${$relativeImages.length} relative image URLs`
     )
     $relativeImages.each((i, img) => {
-      $(img).attr(
-        'src',
-        `${app.repository}/raw/${defaultBranch}/${$(img).attr('src')}`
-      )
+      $(img).attr({
+        'src': `${app.repository.replace('github.com', 'raw.githubusercontent.com')}/${defaultBranch}/${$(img).attr('src')}`,
+        crossorigin: ''
+      })
     })
   }