The html diff script copies source files to diff

For example:

```
index 116c5956..7c0f8eb8 100644
--- 1/tmp/jekyll-diff-ck3w4vzm/A/resume.md
+++ 2/tmp/jekyll-diff-ck3w4vzm/B/resume.md
@@ -4,15 +4,7 @@ # Alexander Gude
```