Fix link to dapr diagrams presentation (#2333)

Signed-off-by: Nick Greenfield <nigreenf@microsoft.com>

daprdocs/content/en/contributing/contributing-docs.md

@@ -36,13 +36,13 @@ These conventions should be followed throughout all Dapr documentation to ensure
 - **Use present tense** - Avoid sentences like "this command will install redis", which implies the action is in the future. Instead use "This command installs redis" which is in the present tense.
 
 ## Diagrams and images
-It is strongly encouraged to create diagrams and images where ever possible for documentation pages. All diagrams are kept in a [Dapr Diagrams Deck](/images/dapr-diagrams.pptx) which has guidance on style and icons. The diagram images are saved as PNG files into the [images folder](/images). 
+It is strongly encouraged to create diagrams and images where ever possible for documentation pages. All diagrams are kept in a Dapr Diagrams Deck, which has guidance on style and icons. The diagram images are saved as PNG files into the [images folder](/images). 
 Diagrams should be;
 - Saved as PNG files with a high resolution
 - Named using the convention of a concept or building block so that they are grouped. For example `service-invocation-overview.png`. Also see Images guidance section below.
 - Added to the correct section in the `Dapr-Diagrams.pptx` deck so that they can be amended and updated.
 
-{{< button text="Download the Dapr Diagrams Deck" link="/images/dapr-diagrams.pptx" >}}
+{{< button text="Download the Dapr Diagrams Deck" link="/presentations/Dapr-Diagrams.zip" >}}
 
 
 ## Contributing a new docs page