Fixes in the readme

Author: insolor

Diff for: README.md

@@ -2,16 +2,19 @@
 
 The index is build from the [index.yml](index.yml) file.
 
-View the index: https://dfint.github.io/pypi-index/
+View the index: <https://dfint.github.io/pypi-index/>
 
 Installation of a package from the index:
-```
+
+```shell
 pip install df-translation-toolkit --extra-index-url https://dfint.github.io/pypi-index/
 ```
 
 Using poetry:
-```
+
+```shell
 poetry source add --priority=explicit dfint https://dfint.github.io/pypi-index/
 poetry add --source=dfint df-translation-toolkit
 ```
+
 Reference: [PEP 503](https://peps.python.org/pep-0503/)