Improve the documentation organization / structure
Description
The documentation tree will benefit from reorganization of articles, primarily indexing / re-indexing articles into top-level buckets, e.g. 'How to', 'Tutorials', 'Design'.
Purpose
To ensure documentation is approachable, and information is not lost due to improper indexing.
Definition of Done
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Top-level documentation tree only contains folders, e.g. 'How to', 'Tutorials', 'Design' -
Article titles use consistent capitalization and style -
Design documents are structured similar to the source code, e.g. AutowareAuto -> common -> xy -> z