Merge pull request #2550 from wallabag/reorder-documentation

Reordered documentation

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+Asynchronous tasks
+==================
+
+In order to launch asynchronous tasks (useful for huge imports for example), we can use RabbitMQ or Redis.
+
+Install RabbitMQ for asynchronous tasks
+---------------------------------------
+
+Requirements
+^^^^^^^^^^^^
+
+You need to have RabbitMQ installed on your server.
+
+Installation
+^^^^^^^^^^^^
+
+.. code:: bash
+
+  wget https://www.rabbitmq.com/rabbitmq-signing-key-public.asc
+  apt-key add rabbitmq-signing-key-public.asc
+  apt-get update
+  apt-get install rabbitmq-server
+
+Configuration and launch
+^^^^^^^^^^^^^^^^^^^^^^^^
+
+.. code:: bash
+
+  rabbitmq-plugins enable rabbitmq_management # (useful to have a web interface, available at http://localhost:15672/ (guest/guest)
+  rabbitmq-server -detached
+
+Stop RabbitMQ
+^^^^^^^^^^^^^
+
+.. code:: bash
+
+  rabbitmqctl stop
+
+
+Configure RabbitMQ in wallabag
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+Edit your ``app/config/parameters.yml`` file to edit RabbitMQ configuration. The default one should be ok:
+
+.. code:: yaml
+
+    rabbitmq_host: localhost
+    rabbitmq_port: 5672
+    rabbitmq_user: guest
+    rabbitmq_password: guest
+
+Enable RabbitMQ in wallabag
+^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+In internal settings, in the **Import** section, enable RabbitMQ (with the value 1).
+
+Launch RabbitMQ consumer
+^^^^^^^^^^^^^^^^^^^^^^^^
+
+Depending on which service you want to import from you need to enable one (or many if you want to support many) cron job:
+
+.. code:: bash
+
+  # for Pocket import
+  bin/console rabbitmq:consumer -e=prod import_pocket -w
+
+  # for Readability import
+  bin/console rabbitmq:consumer -e=prod import_readability -w
+
+  # for Instapaper import
+  bin/console rabbitmq:consumer -e=prod import_instapaper -w
+
+  # for wallabag v1 import
+  bin/console rabbitmq:consumer -e=prod import_wallabag_v1 -w
+
+  # for wallabag v2 import
+  bin/console rabbitmq:consumer -e=prod import_wallabag_v2 -w
+
+  # for Firefox import
+  bin/console rabbitmq:consumer -e=prod import_firefox -w
+
+  # for Chrome import
+  bin/console rabbitmq:consumer -e=prod import_chrome -w
+
+Install Redis for asynchronous tasks
+------------------------------------
+
+In order to launch asynchronous tasks (useful for huge imports for example), we can use Redis.
+
+Requirements
+^^^^^^^^^^^^
+
+You need to have Redis installed on your server.
+
+Installation
+^^^^^^^^^^^^
+
+.. code:: bash
+
+  apt-get install redis-server
+
+Launch
+^^^^^^
+
+The server might be already running after installing, if not you can launch it using:
+
+.. code:: bash
+
+  redis-server
+
+
+Configure Redis in wallabag
+^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+Edit your ``app/config/parameters.yml`` file to edit Redis configuration. The default one should be ok:
+
+.. code:: yaml
+
+    redis_host: localhost
+    redis_port: 6379
+
+Enable Redis in wallabag
+^^^^^^^^^^^^^^^^^^^^^^^^
+
+In internal settings, in the **Import** section, enable Redis (with the value 1).
+
+Launch Redis consumer
+^^^^^^^^^^^^^^^^^^^^^
+
+Depending on which service you want to import from you need to enable one (or many if you want to support many) cron job:
+
+.. code:: bash
+
+  # for Pocket import
+  bin/console wallabag:import:redis-worker -e=prod pocket -vv >> /path/to/wallabag/var/logs/redis-pocket.log
+
+  # for Readability import
+  bin/console wallabag:import:redis-worker -e=prod readability -vv >> /path/to/wallabag/var/logs/redis-readability.log
+
+  # for Instapaper import
+  bin/console wallabag:import:redis-worker -e=prod instapaper -vv >> /path/to/wallabag/var/logs/redis-instapaper.log
+
+  # for wallabag v1 import
+  bin/console wallabag:import:redis-worker -e=prod wallabag_v1 -vv >> /path/to/wallabag/var/logs/redis-wallabag_v1.log
+
+  # for wallabag v2 import
+  bin/console wallabag:import:redis-worker -e=prod wallabag_v2 -vv >> /path/to/wallabag/var/logs/redis-wallabag_v2.log
+
+  # for Firefox import
+  bin/console wallabag:import:redis-worker -e=prod firefox -vv >> /path/to/wallabag/var/logs/redis-firefox.log
+
+  # for Chrome import
+  bin/console wallabag:import:redis-worker -e=prod instapaper -vv >> /path/to/wallabag/var/logs/redis-chrome.log
+
+If you want to launch the import only for some messages and not all, you can specify this number (here 12) and the worker will stop right after the 12th message :
+
+.. code:: bash
+
+  bin/console wallabag:import:redis-worker -e=prod pocket -vv --maxIterations=12