Added Installation guide for Gitlab Pages

doc/usage.ipynb

@@ -692,6 +692,51 @@
     "</div>"
    ]
   },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## Automatic Creation of HTML and PDF output on GitLab Pages\n",
+    "\n",
+    "When using GitLab pages, you can use nbsphinx by adding the file `.gitlab-ci.yml` to your repo and copying the following lines into this file:\n",
+    "```\n",
+    "image: python:3-slim\n",
+    "\n",
+    "variables:\n",
+    "  PIP: python3 -m pip\n",
+    "  SPHINX: python3 -m sphinx -W --keep-going --color\n",
+    "\n",
+    "build-docs:\n",
+    "  stage: build\n",
+    "  script:\n",
+    "    - apt-get update -y\n",
+    "    - apt-get install -y --no-install-recommends pandoc\n",
+    "    - $PIP install -r doc/requirements.txt\n",
+    "    - $SPHINX -d doctrees doc html -b html\n",
+    "    - $SPHINX -d doctrees doc linkcheck -b linkcheck\n",
+    "  artifacts:\n",
+    "    when: always\n",
+    "    paths:\n",
+    "      - html\n",
+    "      - linkcheck/output.*\n",
+    "    \n",
+    "pages:\n",
+    "  stage: deploy\n",
+    "  variables:\n",
+    "    GIT_STRATEGY: none\n",
+    "  script:\n",
+    "    - mv html public\n",
+    "  artifacts:\n",
+    "    paths:\n",
+    "      - public\n",
+    "  rules:\n",
+    "    - if: $CI_COMMIT_REF_NAME == $CI_DEFAULT_BRANCH\n",
+    "```\n",
+    "Note:  \n",
+    "\n",
+    "You migh have to change the line `docs/` to `docs/source` in case that you have this folder structure, which is the default when using `sphinx-quickstart. "
+   ]
+  },
   {
    "cell_type": "markdown",
    "metadata": {},