DOC: Config generator link goes to non-specific introduction

[corneliusroemer]

I clicked on this link: https://lapis.cov-spectrum.org/maintainer-docs/tutorials/generate-your-config
from the docs: https://lapis.cov-spectrum.org/gisaid/v2/docs/maintainer-docs/references/database-configuration

and it went to a nondescript page: https://lapis.cov-spectrum.org/gisaid/v2/docs/