Update conversable agent image (microsoft#1939)

* Update conversable agent image

* fix

* fix

* fix

* fix

website/.gitattributes

@@ -1,11 +1,9 @@
-docs/Tutorial/code_executor_files/figure-markdown_strict/cell-8-output-1.png filter=lfs diff=lfs merge=lfs -text
-docs/Tutorial/assets/Human-in-the-loop.png filter=lfs diff=lfs merge=lfs -text
-docs/Tutorial/assets/conversable-agent.png filter=lfs diff=lfs merge=lfs -text
-docs/Tutorial/.cache/41/cache.db filter=lfs diff=lfs merge=lfs -text
+docs/tutorial/assets/conversable-agent.jpg filter=lfs diff=lfs merge=lfs -text
+docs/tutorial/assets/code-executor-no-docker.png filter=lfs diff=lfs merge=lfs -text
+docs/tutorial/assets/group-chat.png filter=lfs diff=lfs merge=lfs -text
+docs/tutorial/assets/human-in-the-loop.png filter=lfs diff=lfs merge=lfs -text
 docs/tutorial/assets/nested-chats.png filter=lfs diff=lfs merge=lfs -text
 docs/tutorial/assets/sequential-two-agent-chat.png filter=lfs diff=lfs merge=lfs -text
 docs/tutorial/assets/two-agent-chat.png filter=lfs diff=lfs merge=lfs -text
 docs/tutorial/assets/code-execution-in-conversation.png filter=lfs diff=lfs merge=lfs -text
 docs/tutorial/assets/code-executor-docker.png filter=lfs diff=lfs merge=lfs -text
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website/docs/tutorial/introduction.ipynb

@@ -53,7 +53,7 @@
     "and other pluggable and customizable components.\n",
     "\n",
     "```{=mdx}\n",
-    "![ConversableAgent](./assets/conversable-agent.png)\n",
+    "![ConversableAgent](./assets/conversable-agent.jpg)\n",
     "```\n",
     "\n",
     "An example of such agents is the built-in `ConversableAgent` which supports the following components:\n",