fix: change refresh interval from 1 to 0.

At the moment, we only need to check the features once. There's no
need to have things suddenly appear for users who have it loaded already.

website/src/theme/Root.js

@@ -12,7 +12,7 @@ function Root({ children }) {
     const unleashConfig = {
         clientKey: customFields.unleashProxyClientKey,
         url: customFields.unleashProxyUrl,
-        refreshInterval: 1,
+        refreshInterval: 0,
         appName: `docs.getunleash.io-${customFields.environment}`,
     };