Use Sphinx book theme for documentation

.gitlab-scripts/check-template-modules.sh

@@ -8,7 +8,7 @@ do
     module=`basename "${path}"`
     printf "Check $module ... "
     cookiecutter --no-input cookiecutter-module -o "${OUTPUT}" module_name="${module}"
-    for file in tox.ini .readthedocs.yaml doc/conf.py
+    for file in tox.ini .readthedocs.yaml doc/conf.py doc/requirements-doc.txt
     do
         cmp "${path}/${file}" "${OUTPUT}/${module}/${file}"
     done

.gitlab-scripts/generate-doc.sh

@@ -5,6 +5,10 @@ OUTPUTDIR=`realpath "${1}"`
 mkdir -p "${OUTPUTDIR}"
 export DOC_BASE_URL=$OUTPUTDIR
 
+find . -name 'cookiecutter*' -prune -o -path '*/doc/requirements-doc.txt' -print | while read path; do
+    pip install -r "${path}"
+done
+
 (find . -name 'cookiecutter*' -prune -o -path '*/doc/conf.py' -print | while read path; do
     path=`dirname "${path}"`
     path=`dirname "${path}"`