Revert "gitlab-ci: job must be called 'pages' to deploy to GitLab Pages"

This reverts commit c5daf198.

Turns I was confused here.  Yes, the job has to be called "pages" if the
job is deploying to GitLab Pages.  But in the case of `fdroid nightly`, the
thing that is deploying to GitLab Pages is the .gitlab-ci.yml that is in
the *-nightly repo, which is auto-generated by `fdroid nightly`.

fdroidserver#649
5 jobs for master in 33 minutes and 6 seconds (queued for 3 seconds)
Status Job ID Name Coverage
  Test
passed #202937084
connected 22 default armeabi-v7a

00:23:10

passed #202937085
fdroid kvm
connected 26 google_apis x86

00:07:24

passed #202937083
errorprone

00:10:35

passed #202937081
test_lint_pmd_checkstyle

00:18:19

 
  Deploy
passed #202937087
deploy_nightly

00:09:40