docs(image_handling.md): architecture doc on image handling on the proxy

docs/my-website/docs/proxy/image_handling.md

@@ -0,0 +1,21 @@
+import Image from '@theme/IdealImage';
+import Tabs from '@theme/Tabs';
+import TabItem from '@theme/TabItem';
+
+# Image URL Handling 
+
+<Image img={require('../../img/image_handling.png')}  style={{ width: '900px', height: 'auto' }} />
+
+Some LLM API's don't support url's for images, but do support base-64 strings. 
+
+For those, LiteLLM will:
+
+1. Detect a URL being passed
+2. Check if the LLM API supports a URL
+3. Else, will download the base64 
+4. Send the provider a base64 string. 
+
+
+LiteLLM also caches this result, in-memory to reduce latency for subsequent calls. 
+
+The limit for an in-memory cache is 1MB. 

docs/my-website/sidebars.js

@@ -53,7 +53,7 @@ const sidebars = {
         {
           type: "category",
           label: "Architecture",
-          items: ["proxy/architecture", "proxy/db_info", "router_architecture", "proxy/user_management_heirarchy", "proxy/jwt_auth_arch"],
+          items: ["proxy/architecture", "proxy/db_info", "router_architecture", "proxy/user_management_heirarchy", "proxy/jwt_auth_arch", "proxy/image_handling"],
         },
         {
           type: "link",