docs: two more options for chain images

Author: amessbee

main/guides/orchestration/index.md

@@ -21,6 +21,7 @@ Agoric’s Orchestration APIs simplify controlling accounts on remote chains, mo
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 ## Orchestration Overview
 
 Agoric's Orchestration API is a tool to help developers build seamless applications out of disparate interoperable chains and services. This composability allows for the development of user-centric applications that leverage the unique strengths of different blockchain ecosystems.