Add: AfyaAI + DiasporaAI — Kenya health AI and US-Kenya diaspora navigator

[gabrielmahia]

Two new tools:

AfyaAI: NHIF calculator, hospital finder, maternal health EN/SW. afyaai.streamlit.app | GitHub

DiasporaAI: US-Kenya life navigator — FBAR, remittances, investment, dual citizenship. diasporaai.streamlit.app | GitHub

27 tools total: https://gabrielmahia.github.io