Replace github sponsor link to be our online store

Author: SteveMicroNova

.github/FUNDING.yml

@@ -9,4 +9,4 @@ community_bridge: # Replace with a single Community Bridge project-name e.g., cl
 liberapay: # Replace with a single Liberapay username
 issuehunt: # Replace with a single IssueHunt username
 otechie: # Replace with a single Otechie username
-custom: https://www.kickstarter.com/projects/micro-nova/amplipi-home-audio-system # Replace with up to 4 custom sponsorship URLs e.g., ['link1', 'link2']
+custom: https://www.amplipro.com/shop # Replace with up to 4 custom sponsorship URLs e.g., ['link1', 'link2']