feat(icons): add AI Assistants icon

[dkundel]

Feel free to Slack me for details.

Also the contribution guide said to run yarn workspace @twilio-paste/icons convert which ended up in deleting all the other icons other than mine. This PR instead used the following commands which looked more right:

yarn workspace @twilio-paste/icons convert-new
yarn workspace @twilio-paste/icons list-icons

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🦋 Changeset detected

Latest commit: b430131

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 2 packages

Name	Type
@twilio-paste/icons	Minor
@twilio-paste/website	Patch

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[TheSisb]

PR looks good, and good callout on our README!

Were you still adding the responsive behavior or should we ship this as is?

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