fix(ci): missing package installation

.gitlab-ci.yml

@@ -39,6 +39,7 @@ pages:
   rules:
     - if: $CI_COMMIT_REF_NAME == $CI_DEFAULT_BRANCH
   script:
+    - R -q -e 'devtools::install(dependencies = TRUE)'
     - R -q -e 'fairify::build_site()'
   artifacts:
     paths: