Generate top-level and individual API reference docs for all SDK clients#36

arandito wants to merge 3 commits intoawslabs:feat/migrate-sphinx-to-mkdocsawslabs/aws-sdk-python:feat/migrate-sphinx-to-mkdocsfrom

arandito:add-top-level-docsarandito/aws-sdk-python:add-top-level-docsCopy head branch name to clipboard