Update readme.md

Updated series link

Author: MattFarm

PVA Architecture Series/readme.md

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 <img src="img/PVA_Arch_Title.png" width="797" alt="Architecture series title page">
 
-Supplementary materials for the Power Virtual Agents Architecture series. View the series: <https://www.youtube.com/playlist?list=PLi9EhCY4z99W2QOTgbwhFZEjpqc8YZDVH>
+Supplementary materials for the Power Virtual Agents Architecture series. View the series: <https://aka.ms/pvaarchitectureseries>
 
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