Add style pdf

Change-Id: I8f382a2382beee732fac7af35c88111dc2d8341d

.gitmodules

+[submodule "userguide/userguide/src/mkpdfs-mkdocs-plugin"]
+	path = userguide/userguide/src/mkpdfs-mkdocs-plugin
+	url = https://github.com/jwaschkau/mkpdfs-mkdocs-plugin.git

mkpdfs-mkdocs-plugin @ 655bea6f

+Subproject commit 655bea6fd66933876e5b93bca63f430935aa6b5b

userguide/src/package-lock.json

+{
+  "lockfileVersion": 1
+}

mkpdfs-mkdocs-plugin @ 655bea6f

+Subproject commit 655bea6fd66933876e5b93bca63f430935aa6b5b