Restructure the getting started guide

[dagardner-nv]

• Includes changes from PRs Reorg docs #522 & Morpheus not "Morpheus SDK" #534
• Moves docs/source/basics/examples.rst into examples/basic_usage and reformat as markdown. This avoids the issue of having two "examples" in the table of contents.
• Update remaining references to the quickstart guide with "cloud deployment".
• Create Parallel index.rst for the developer guides and examples, as markdown doesn't have the equivalent of the toctree macro.
• Restructure docs/source/getting_started.md making it clear which steps are and are not needed when using pre-built containers.
• Highlight the examples from top-level docs

relates to issue #495

[mdemoret-nv]

This is a good first start. We will probably iterate in the future.

[dagardner-nv]

@gpucibot merge