add pages generation via pkgdown

.Rbuildignore

@@ -23,3 +23,4 @@
 ^windows
 ^doc$
 ^Meta$
+^_pkgdown.yml$

.gitlab-ci.yml

@@ -157,3 +157,19 @@ deploy:
   script:
     - sshpass -e ssh -o StrictHostKeyChecking=no $DEPLOY_USER@$DEPLOY_IP "./launch.sh $CI_REGISTRY_USER $CI_REGISTRY_PASSWORD $CI_REGISTRY_IMAGE latest"
 
+pages:
+  stage: deploy
+  image: rocker/tidyverse:4.0.1
+  before_script:
+    - apt-get update
+    - apt-get install -y --no-install-recommends libgsl-dev libudunits2-dev libproj-dev libgdal-dev libharfbuzz-dev libfribidi-dev 
+  script:
+    - Rscript -e 'install.packages(c("devtools", "pkgdown"), repos="cloud.r-project.org")'
+    - Rscript -e 'devtools::install()'
+    - Rscript -e 'pkgdown::build_site(override = list(destination = "public"))'
+  artifacts:
+    paths:
+      - public
+  rules:
+    - if: '$CI_COMMIT_BRANCH == "master"'
+      when: always

_pkgdown.yml

+repo:
+  url:
+  home: https://gitlab.paca.inrae.fr/CSIRO-INRA/landsepi
+
+navbar:
+  structure:
+    left:  [home, intro, reference, articles, tutorials, news]
+    right: [gitlab]
+  components:
+    gitlab:
+      icon: fab fa-gitlab fa-lg
+      href: https://gitlab.paca.inrae.fr/CSIRO-INRA/landsepi
+      github:
+        icon: fab fa-gitlab fa-lg
+        href: https://gitlab.paca.inrae.fr/CSIRO-INRA/landsepi