New quickstart guide.
Edits and changes.
Correct the Flowlet name, and adjust text.
Additional reorganizing.
Another change.
Rename files to use hyphens to show word breaks in filenames; change landing page from table of contents to intro; other updates.
Merge branch 'release/2.5.0' into feature/r2.5.1_getting_started

Conflicts:
	cdap-docs/developer-guide/source/case-study.rst
Fix build script.
Fix the build script to use a relative path to alternative source directories; re-organized all the docs...
More reorganization.
Fix capitalization
Changes.
more changes and updates.
Updates.
Update.
Updates.
Fixed intersphinx_mapping between dockets.
Updates.
Adding message about completion of zipping; adjusting titles.
Create a common glossary for all guides.