generate rst doc pages for command line tools (#27530)

* let generate_man also gen rst pages for cli tools
* make template-file, output-dir, output format cli options for generate_man
* update main Makefile to use generate_man.py for docs (man pages and rst)
* update vault docs that use :option:
* Edits based on
6e34ea6242 and
a3afc78535

* add a optparse 'desc' to lib/ansible/cli/config.py 

  The man page needs a short desc for the 'NAME' field
  which it gets from the option parse 'desc' value.

  Fixes building ansible-config man page.

* add trim_docstring from pep257 to generate_man

  use pep258 docstring trim function to fix up any indention
  weirdness inherit to doc strings (ie, lines other than
  first line being indented.

* Add refs to cli command actions

To reference ansible-vaults --vault-id option, use:

:option:`The link text here <ansible-vault --vault-id>`

or:

:option:`--vault-id <ansible-vault --vault-id>`

To reference ansible-vault's 'encrypt' action, use:

:ref:`The link text here <ansible_vault_encrypt>`

or most of the time:

:ref:`ansible-vault encrypt <ansible_vault_encrypt>`

docs/docsite/rst/command_line_tools.rst

@@ -0,0 +1,15 @@
+Command Line Tools
+==================
+
+
+.. toctree:: :maxdepth: 1
+
+    ansible
+    ansible-playbook
+    ansible-vault
+    ansible-galaxy
+    ansible-console
+    ansible-config
+    ansible-doc
+    ansible-inventory
+    ansible-pull