Add inference-with-keras.ipynb to PaliGemma docs

[elisabandy]

Adds a copy of the Inference with Keras notebook for the PaliGemma docs.

Description of the change

Uploads a copy of the Inference with Keras notebook. The only difference here is that this copy also includes the Apache License 2.0 info.

Motivation

We need a copy of the notebook in GitHub so that users can open the notebook in Colab directly.

Type of change

Documentation

Checklist

• [x] I have performed a self-review of my code.
• [x] I have added detailed comments to my code where applicable.
• [x] I have verified that my change does not break existing code.
• [x] My PR is based on the latest changes of the main branch (if unsure, please run git pull --rebase upstream main).
• [x] I am familiar with the Google Style Guide for the language I have coded in.
• [x] I have read through the Contributing Guide and signed the Contributor License Agreement.

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[elisabandy]

Failing lints, we should fix.

Fixed the Apache License and the copyright and the malformed link. IMO in this case the "we've" is okay since it's stating something that we (the PaliGemma team) have done literally and not an expectation on the user.