security: access control for particles (#169)

* setup firebase custom token

* docs

* docs

* feat: allow admin removing members from a network

* fix: properly handle fallback avatar and names

This is especially helpful in the case of members who were removed from
a network

js/src/features/particles/stream-view.tsx

@@ -405,7 +405,7 @@ function StreamViewInner({ path, streamParticle }: StreamViewProps) {
           />
         );
       default:
-        return <FallbackParticleView particle={particle} />;
+        return <FallbackParticleView particle={particle} networkId={networkId} />;
     }
   }