Versioned documentation without trailing slash breaks links.

[abernix]

This is a problem that only affects the root documentation, but it seems if you go to https://www.apollographql.com/docs/apollo-server/v2 (without the trailing slash), that none of the sidebar links take you to actual pages — instead they 404.

With the trailing slash (https://www.apollographql.com/docs/apollo-server/v2/), everything works properly.