updated plugin docs (#30490)

* updated  docs

- for devs:
  - added inventory/vars section
  - made some updates to general section and other plugin types
- for users:
 - added 'user' plugin section to start describing the plugins
 - docs on types, what they are and how to use

- removed ref to deleted AUTHORS file
- corrected several typos/headers
- added descriptions to config.rst template
- ignore generated files for cli/plugins and config
- remove new generated files on `make clean`
- moved details from devguid and intro doc to plugin specific pages
- pretied up lookup notes
- changed precedence ref to not conflict config
- removed duplicate config data, as config is autogenerated and up to date
- put new plugins under playbooks
- added `pass` cause rst/python dislikes fractions
- removed dupe in .gitignore, alpha sorted to avoid moar dupes
- added try cause rst/python freaks out

* generate plugins into their own dir

only do plugins that support docs
use toctree from main plugins page

docs/docsite/rst/plugins/cache.rst

@@ -0,0 +1,65 @@
+.. contents:: Topics
+
+
+Cache Plugins
+-------------
+
+This plugin implelents a backend caching mechanism for Ansible to store gathered facts or inventory source data
+to avoid the cost of retrieving them from source.
+
+The default plugin is the :doc:`memory <cache/memory>` plugin which will only cache the data for the current execution of Ansible.
+Other plugins with persistent storage are available to allow caching the data across runs.
+
+
+Enabling Cache Plugins
+++++++++++++++++++++++
+
+Only one cache plugin can be active at a time.
+
+You can enable in configuration, either via environment variable:
+
+.. code-block:: shell
+
+    export ANSIBLE_CACHE_PLUGIN=jsonfile
+
+or in the ``ansible.cfg`` file:
+
+.. code-block:: ini
+
+    [defaults]
+    fact_caching=redis
+
+You will also need to setup other settings specific to each plugin, you can check the individual plugin documenattion
+or the ansible :doc:`configuration <../config>` for more details.
+
+Plugin List
++++++++++++
+
+You can use ``ansible-doc -t cache -l`` to see the list of available plugins,
+use ``ansible-doc -t cache <plugin name>`` to see specific documents and examples.
+
+.. toctree:: :maxdepth: 1
+    :glob:
+
+    cache/*
+
+.. seealso::
+
+   :doc:`action`
+       Ansible Action plugins
+   :doc:`callback`
+       Ansible callback plugins
+   :doc:`connection`
+       Ansible connection plugins
+   :doc:`inventory`
+       Ansible inventory plugins
+   :doc:`shell`
+       Ansible Shell plugins
+   :doc:`strategy`
+       Ansible Strategy plugins
+   :doc:`vars`
+       Ansible Vars plugins
+   `User Mailing List <http://groups.google.com/group/ansible-devel>`_
+       Have a question?  Stop by the google group!
+   `irc.freenode.net <http://irc.freenode.net>`_
+       #ansible IRC chat channel