(doc) Adding placeholder for proxy information

Author: gep13

mkdocs.yml

@@ -15,6 +15,7 @@ pages:
   - Example of Export Configuration: configuration/export-configuration.md
   - Issues to include: configuration/include-issues.md
   - Issues to exclude: configuration/exclude-issues.md
+  - Using a Proxy: configuration/proxy.md
 - Commands:
   - Create: commands/create.md
   - Add Assets: commands/add-assets.md
@@ -27,4 +28,4 @@ pages:
   - Configure Logging: logging/logging.md
 - Credits:
   - Particular Software: credits/particular.md
-  - Icon: credits/icon.md
+  - Icon: credits/icon.md