[Docs] Remove non-existent figure and misleading info from dev/setup

docs/dev/01_setup.rst

@@ -109,13 +109,6 @@ development server against a local PostgreSQL database with password
 
   ALEKSIS_maintenance__debug=true ALEKSIS_database__password=aleksis poetry run aleksis-admin runuwsgi
 
-.. figure:: /screenshots/index.png
-   :scale: 50%
-   :alt: Screenshot of index page
-
-   After installing the development environment with default settings,
-   you should see the index page with the Bootstrap style.
-
 .. _Poetry: https://poetry.eustace.io/
 .. _Poetry installation methods: https://poetry.eustace.io/docs/#installation
 .. _Yarn: https://yarnpkg.com