include documentation chapter about redirects and dimensions

[klfman]

The other day I asked in the neos-slack: "Hey guys, I'm currently making a website multi-language with content dimensions. I'm also using neos/redirecthandler-ui (1.1.3). Do I need to explicitly change configuration if I want multilanguage and the rewritten urls (with the language specific path segments like /en/) to work with the redirect stuff?"

To answer this question https://neos-redirecthandler-adapter.readthedocs.io/en/stable/ should probably include a small remark about this.