Update masthead illustration

[abrichr]

@QAI.help Current illustration:

Desired illustration (from https://docs.google.com/presentation/d/10eFiKwqTu2kKYc8-5aXNObcSRC3Dsi34zvuSF59X9B0):

This task involves:

1. Adding the relevant .svg files (see https://thenounproject.com/search/icons/?iconspage=1&q=artificial%20intelligence and https://www.vecteezy.com/free-vector/ai-icon)
2. Displaying them as in https://github.com/OpenAdaptAI/web/blob/main/components/MastHead.js#L47
3. Adding subtle animations as in https://github.com/OpenAdaptAI/web/blob/main/components/MastHead.js#L24

Thanks for requesting QAI's help! A PR will be created shortly.

Thanks for requesting QAI's help! A PR will be created shortly.

Issue addressed in the following PR: #18

[abrichr]

@jesicasusanto @dianzrong please feel free to assign yourselves! 🙏

Thanks for your feedback! I'll work on it.