Generate a rst for config and env options from base.yml (#28739)

* wip, gen docs from config/base.yml

* wip

* dont change conf.py here

* cleanup, add dump_config --template-file cli opt

* some desc are string, some are lists...

TODO: fix base.yml so it is consistent

* Filter out TODO and empty descriptions

docs/docsite/rst/index.rst

@@ -38,6 +38,7 @@ Ansible, Inc. releases a new major release of Ansible approximately every two mo
    galaxy
    test_strategies
    faq
+   config
    glossary
    YAMLSyntax
    porting_guides