Add back index link

Author: aliu39

docs/platforms/python/feature-flags/index.mdx

@@ -16,5 +16,6 @@ Evaluation tracking requires enabling an SDK integration. Integrations are provi
 
 - [OpenFeature](/platforms/python/integrations/openfeature/)
 - [LaunchDarkly](/platforms/python/integrations/launchdarkly/)
+- [Manual Tracking](/platforms/python/integrations/featureflags/) - if you use an unsupported or in-house provider, you may track evaluations through an API.
 
 <PlatformContent includePath="feature-flags/enable-change-tracking" />