Disable react strict mode to prevent double rendering

See https://stackoverflow.com/questions/61254372/my-react-component-is-rendering-twice-because-of-strict-mode

Signed-off-by: Tilman Vatteroth <git@tilmanvatteroth.de>

next.config.js

@@ -73,7 +73,7 @@ const rawNextConfig = {
     )
     return config
   },
-  reactStrictMode: true,
+  reactStrictMode: false,
   redirects: () => {
     return Promise.resolve([
       {