chore(docs): remove unused attachments

docs/User Guide/User Guide/Basic Concepts and Features/Notes/Export as PDF.md

@@ -17,7 +17,7 @@ Note that if you are using Linux with the GNOME desktop environment, sometimes t
 
 To solve this, you can change the recommended application for PDFs via this command line. First, list the available applications via `gio mime application/pdf` and then set the desired one. For example to use GNOME's Evince:
 
-```sh
+```
 gio mime application/pdf
 ```
 

docs/User Guide/User Guide/Theme development/Creating a custom theme.md

@@ -5,7 +5,7 @@ Organization is an important aspect of managing a knowledge base. When developin
 
 As such, the first step is to create a new note to gather all the themes.
 
-![](1_Creating%20a%20custom%20theme_5_.png)
+![](Creating%20a%20custom%20theme_5_.png)
 
 ## Step 2. Create the theme