Move documentation to gitlab pages

See merge request !318

.gitlab-ci.yml

-make:
-    image: sphinxdoc/sphinx
-    script:
-        - apt-get update
-        - apt-get install -y pandoc
-        - apt-get install -y openssh-client
-        - pip3 install sphinx-rtd-theme
-        - pip3 install sphinx-autoapi
-        - pip3 install nbsphinx
-        - cd doc
-        - make html
-        - eval $(ssh-agent)
-        - echo "$SSHKEY" | ssh-add -
-        - ssh -o UserKnownHostsFile=known_hosts wp86team@exflqr30526 "./doc-prepare toolbox/$CI_COMMIT_REF_NAME"
-        - scp -o UserKnownHostsFile=known_hosts -r _build/html wp86team@exflqr30526:html/toolbox/$CI_COMMIT_REF_NAME
-
+# The Docker image that will be used to build your app
+image: sphinxdoc/sphinx
+# Functions that should be executed before the build script is run
+before_script: []
+pages:
+  script:
+    - make html
+  artifacts:
+    paths:
+      # The folder that contains the files to be exposed at the Page URL
+      - public
+  rules:
+    # This ensures that only pushes to the default branch will trigger
+    # a pages deploy
+    - if: $CI_COMMIT_REF_NAME == $CI_DEFAULT_BRANCH

README.rst

 Documentation
 #############
 
-Online documentation can be found at `ReadTheDocs <https://rtd.xfel.eu/docs/scs-toolbox/en/latest/>`_.
-
-From within the XFEL office network, documentation for the git branches may be found `here <http://exflqr30526.desy.de:8000/toolbox/>`_.
+Online documentation can be found `here <https://scs.pages.xfel.eu/toolbox/>`_.
\ No newline at end of file

doc/Makefile

@@ -5,7 +5,7 @@
 SPHINXOPTS    =
 SPHINXBUILD   = sphinx-build
 SOURCEDIR     = .
-BUILDDIR      = _build
+BUILDDIR      = public
 
 # Put it first so that "make" without argument is like "make help".
 help: