Revert "gitlab-ci: Run pages job only for master branch"

This reverts commit 23c9ad6f.
6 jobs for pages in 3 minutes and 12 seconds (queued for 5 seconds)
latest
Status Job ID Name Coverage
  Test
passed #488183
test-compilation

00:00:33

passed #488184
test-links

00:00:32

passed #488185
test-remote-links

00:01:42

 
  Build
passed #488186
build

00:00:42

 
  Pages
passed #488187
pages

00:00:47

 
  Deploy
failed pages:deploy

00:00:01