Prepare for multi-project pipeline

```
.venv/bin/poetry add diff_match_patch
```
And some code changes
http://localhost:8000/versions/?law_name=f&version_a=1394825&version_b=1416783

http://localhost:8000/versions/?law_name=f&version_a=1394825&version_b=1416783

Just prints aaaaa but it's a start

http://localhost:8000/versions/?law_name=f&version_a=1&version_b=2

Wouldn't build without the bot version change, and the expose is as a
comment to what port we need to access the app