Merge "Update index.rst" into frankfurt

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+..
+ This work is licensed under a Creative Commons Attribution 4.0
+ International License.
+
+================
+Upgrade Strategy
+================
+
+HAS can be upgraded in place(remove and replace) or using a blue-green
+strategy.
+
+There is no database migration required.
+
+Supporting Facts
+================
+
+HAS only stores the info and status of the incoming homing requests. It
+leverages MUSIC APIs for storing this information. It also leverages
+MUSIC for communication among the HAS components. So, redeploying HAS
+will not impact the data stored in MUSIC.