Add fix from vuejs#1235 to fix bitbucket links.

fago · fago · commit 2b971785e47c · 2019-02-11T15:23:05.000+01:00
diff --git a/lib/default-theme/Page.vue b/lib/default-theme/Page.vue
@@ -159,6 +159,7 @@ export default {
         : `https://github.com/${docsRepo}`
 
       return (
+        `/src` +
         base.replace(endingSlashRE, '') +
         `/edit/${docsBranch}` +
         (docsDir ? '/' + docsDir.replace(endingSlashRE, '') : '') +
