nit: add colab button

[bebechien]

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[review-notebook-app]

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[gemini-code-assist]

Summary of Changes

Hello @bebechien, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request focuses on improving the user experience for several Jupyter notebooks by integrating direct links to Google Colab. This enhancement allows users to effortlessly launch and interact with the notebooks in a cloud-based environment, thereby streamlining the process of running and experimenting with the provided code examples and reducing friction for new users.

Highlights

• Colab Button Integration: A 'Run in Google Colab' button has been added to the top of three Jupyter notebooks, providing direct access to execute them in a cloud-based environment.
• Enhanced Notebook Accessibility: The addition of these buttons significantly improves the accessibility and ease of use for users wishing to interact with the provided code examples without local setup.

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[gemini-code-assist]

Code Review

This pull request adds a 'Run in Google Colab' button to three Jupyter notebooks. My review identifies issues with the HTML structure of this button. The current implementation uses an invalid HTML table and lacks an alt attribute for the image, which is important for accessibility. I've provided suggestions to simplify the HTML using a div and to add the alt attribute, improving both correctness and accessibility. These changes are recommended for all three modified notebooks.

[gemini-code-assist]

The HTML for the Colab button is not well-formed. The <table> is missing a <tr> element, and the <img> tag lacks an alt attribute, which is an accessibility issue. A simpler and more correct approach is to use a div for alignment, as a table is not necessary for a single element.

Suggested change

	"<table align=\"left\">\n",
	" <td>\n",
	" <a target=\"_blank\" href=\"https://colab.research.google.com/github/google-gemini/gemma-cookbook/blob/main/Demos/Emoji-Gemma-on-Web/resources/Convert_Gemma_3_270M_to_LiteRT_for_MediaPipe_LLM_Inference_API.ipynb\"><img src=\"https://www.tensorflow.org/images/colab_logo_32px.png\" />Run in Google Colab</a>\n",
	" </td>\n",
	"</table>"
	"<div align=\"left\"><a target=\"_blank\" href=\"https://colab.research.google.com/github/google-gemini/gemma-cookbook/blob/main/Demos/Emoji-Gemma-on-Web/resources/Convert_Gemma_3_270M_to_LiteRT_for_MediaPipe_LLM_Inference_API.ipynb\"><img src=\"https://www.tensorflow.org/images/colab_logo_32px.png\" alt=\"Google Colab logo\" />Run in Google Colab</a></div>"

[gemini-code-assist]

The HTML for the Colab button is not well-formed. The <table> is missing a <tr> element, and the <img> tag lacks an alt attribute, which is an accessibility issue. A simpler and more correct approach is to use a div for alignment, as a table is not necessary for a single element.

Suggested change

	"<table align=\"left\">\n",
	" <td>\n",
	" <a target=\"_blank\" href=\"https://colab.research.google.com/github/google-gemini/gemma-cookbook/blob/main/Demos/Emoji-Gemma-on-Web/resources/Convert_Gemma_3_270M_to_ONNX.ipynb\"><img src=\"https://www.tensorflow.org/images/colab_logo_32px.png\" />Run in Google Colab</a>\n",
	" </td>\n",
	"</table>"
	"<div align=\"left\"><a target=\"_blank\" href=\"https://colab.research.google.com/github/google-gemini/gemma-cookbook/blob/main/Demos/Emoji-Gemma-on-Web/resources/Convert_Gemma_3_270M_to_ONNX.ipynb\"><img src=\"https://www.tensorflow.org/images/colab_logo_32px.png\" alt=\"Google Colab logo\" />Run in Google Colab</a></div>"

[gemini-code-assist]

The HTML for the Colab button is not well-formed. The <table> is missing a <tr> element, and the <img> tag lacks an alt attribute, which is an accessibility issue. A simpler and more correct approach is to use a div for alignment, as a table is not necessary for a single element.

Suggested change

	"<table align=\"left\">\n",
	" <td>\n",
	" <a target=\"_blank\" href=\"https://colab.research.google.com/github/google-gemini/gemma-cookbook/blob/main/Demos/Emoji-Gemma-on-Web/resources/Fine_tune_Gemma_3_270M_for_emoji_generation.ipynb\"><img src=\"https://www.tensorflow.org/images/colab_logo_32px.png\" />Run in Google Colab</a>\n",
	" </td>\n",
	"</table>"
	"<div align=\"left\"><a target=\"_blank\" href=\"https://colab.research.google.com/github/google-gemini/gemma-cookbook/blob/main/Demos/Emoji-Gemma-on-Web/resources/Fine_tune_Gemma_3_270M_for_emoji_generation.ipynb\"><img src=\"https://www.tensorflow.org/images/colab_logo_32px.png\" alt=\"Google Colab logo\" />Run in Google Colab</a></div>"