Fix readme (#1495)

Fix readme


Summary:

Test Plan:

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cookbooks/Basic-Prompt-Routing/README.md

@@ -1,14 +1,14 @@
 # Basic Prompting Routing - AI Teaching Assistant
 
-[![colab](https://colab.research.google.com/drive/1ue0ZAEdlalw57JwTtXlfl8kH8W_j1XQq#scrollTo=kNmnUZnUFzt3)]
+[![colab](https://colab.research.google.com/assets/colab-badge.svg)](https://colab.research.google.com/drive/1ue0ZAEdlalw57JwTtXlfl8kH8W_j1XQq#scrollTo=kNmnUZnUFzt3)
 
 This demo shows prompt routing with AIConfig. We used streamlit to host the app so you can interact with the assistant!
 Alternatively, you can run the aiconfig in an ipynb
 
-![image](https://github-production-user-asset-6210df.s3.amazonaws.com/81494782/282203473-f779feb6-339d-4331-9aed-1761b845100a.png)
-
 ## Streamlit
 
+![image](https://github-production-user-asset-6210df.s3.amazonaws.com/81494782/282203473-f779feb6-339d-4331-9aed-1761b845100a.png)
+
 ### How does it work?
 
 The user asks a question. The LLM decides the topic as math, physics, or general. Based on the topic, the LLM selects a different "assistant" to respond. These assistants have different system prompts and respond with varying introductions and style of response.
@@ -25,6 +25,6 @@ The user asks a question. The LLM decides the topic as math, physics, or general
 
 ## IPython Notebook
 
-[![colab](https://colab.research.google.com/drive/1ue0ZAEdlalw57JwTtXlfl8kH8W_j1XQq#scrollTo=kNmnUZnUFzt3)]
+[![colab](https://colab.research.google.com/assets/colab-badge.svg)](https://colab.research.google.com/drive/1ue0ZAEdlalw57JwTtXlfl8kH8W_j1XQq#scrollTo=kNmnUZnUFzt3)
 
 Open assistant.ipynb in this folder, or in Colab, to use the aiconfig