Display 5 worst predictions at the end of evaluation

Based on !339 (merged)

Closes #245 (closed)

docs/get_started/index.md

@@ -26,6 +26,12 @@ To install DAN manually, you need to first clone via:
 git clone git@gitlab.teklia.com:atr/dan.git
 ```
 
+Then you can initialize the [`Nerval`](https://gitlab.teklia.com/ner/nerval) submodule:
+
+```shell
+git submodule update --init --recursive
+```
+
 Then you can install it via pip:
 
 ```shell