Add recipe for Paperless NG

* First pass at adding recipe for Paperless NG

* Added description of stack contents and a footnote

* Added Paperless entry to mkdocs.yml

* Updated changelog

* Fixed copy/paste error on env file name

* Requested edits

* Added description blurb

* Renamed page and added common link

* Formatting fixes

* Link fixes

* Formatting fix (again)

* Typo

* Requested edits

* Added front matter description

* Removed unused env file from db-backup

manuscript/book.txt

@@ -67,6 +67,7 @@ recipes/keycloak/setup-oidc-provider.md
 recipes/openldap.md
 recipes/mail.md
 recipes/minio.md
+recipes/paperless-ng.md
 recipes/piwik.md
 recipes/photoprism.md
 recipes/portainer.md