Exclude demo gif from extension build (#2481)

Author: mrubens

.vscodeignore

@@ -20,7 +20,6 @@ vsc-extension-quickstart.md
 **/.vscode-test.*
 
 # Custom
-demo.gif
 .nvmrc
 .gitattributes
 .prettierignore
@@ -51,6 +50,8 @@ webview-ui/node_modules/**
 # Include default themes JSON files used in getTheme
 !src/integrations/theme/default-themes/**
 
+# Ignore doc assets
+assets/docs/**
 # Include icons and images
 !assets/icons/**
 !assets/images/**