update docs

docs/10_Description.md

@@ -7,3 +7,5 @@ When editing login pages in Ilias 9 then javascript is now filtered out while sa
 This is a standalone login page that offers a list of organisations and can be customized.
 
 This reads the discofeed. By a given positive list of Idps it shows a list of identity providers to login on the visitors organisation.
+
+![Login screen with mode "boxes"](images/login_mode_boxes.png)

docs/40_Installation.md

@@ -10,7 +10,7 @@ git clone https://git-repo.iml.unibe.ch/iml-open-source/login-aai.git login_aai
 cd login_aai
 ```
 
-#### Manuel steps
+#### Manual steps
 
 * Download the archive <https://git-repo.iml.unibe.ch/iml-open-source/login-aai/-/archive/main/login-aai-main.zip> (archive formats tar.gz, tar.bz2 and tar are available too).
 * In the webroot create a subfolder "login_aai".