Disable docs lint internal_links check
This check never worked once the global navigation changes were rolled out in https://gitlab.com/gitlab-com/gitlab-docs/merge_requests/362. The global nav will ALWAYS include /ce and /ee links, and the CE and EE repos will never include documentation for both. gitlab-docs now expects the documentation to be in the following directories:
- /tmp/gitlab-docs/ce (CE)
- /tmp/gitlab-docs/ee (EE)
- /tmp/gitlab-docs/omnibus (Omnibus)
The problem is that the CE and EE repos will only include one of the first two.
Let's disable this check until https://gitlab.com/gitlab-com/gitlab-docs/issues/305 is resolved.