more documentation.

docs/configuration.rst

@@ -0,0 +1,22 @@
+*************
+Configuration
+*************
+
+Paperless provides a wide range of customizations.
+Have a look at ``paperless.conf.example`` for available configuration options.
+Depending on how you run paperless, these settings have to be defined in different
+places.
+
+*   If you run paperless on docker, ``paperless.conf`` is not used. Rather, configure
+    paperless by copying necessary options to ``docker-compose.env``.
+*   If you are running paperless on anything else, paperless will search for the
+    configuration file in these locations and use the first one it finds:
+
+    .. code::
+
+        /path/to/paperless/paperless.conf
+        /etc/paperless.conf
+        /usr/local/etc/paperless.conf
+
+    Copy ``paperless.conf.example`` to any of these locations and adjust it to your
+    needs.

docs/index.rst

@@ -47,6 +47,7 @@ Contents
    usage_overview
    advanced_usage
    administration
+   configuration
    api
    extending
    troubleshooting

docs/setup.rst

@@ -127,7 +127,8 @@ how you installed paperless. The important things to keep in mind are as follows
   with your current paperless media and data volumes and used the default
   sqlite database, **it will not use your sqlite database and it may seem
   as if your documents are gone**. You may use the provided
-  ``docker-compose.yml.sqlite.example`` script, which does not use postgresql.
+  ``docker-compose.yml.sqlite.example`` script, which does not use postgresql. See
+  :ref:`setup-sqlite_to_psql` for details.
 * The task scheduler of paperless, which is used to execute periodic tasks
   such as email checking and maintenance, requires a `redis`_ message broker
   instance. The docker-compose route takes care of that.
@@ -177,6 +178,8 @@ Migration to paperless-ng is then performed in a few simple steps:
     everything related to paperless in your browsers data in order to fix
     this issue.
 
+.. _setup-sqlite_to_psql:
+
 Moving data from sqlite to postgresql
 =====================================