* cleanup to reflect current builds
* consolidate templating docs and minor rewording
* new templating intro page
* fixed warnings as per feedback
* Update playbooks_filters.rst
Edited for clarity.
* Update playbooks_templating.rst
Light edits
* developing_modules.rst is now in dev_guide, sync changes and delete the old version
* Cleaner RST & formatted code
* Tidyup roadmaps
* Link to repomerge
* Pull in abadger's fixes From https://github.com/ansible/ansible/compare/docs-code-block-fixes?expand=1
* Clean docsite/rst (apart from ROADMAP
