Create a library using mdbookshelf

[philgweber]

Added some overview documents and structures and web content for creating a library with multiple shelves.

I want to pull in this main structure then finish adding getting started and overview guides. The documentation is to be broken into the following areas (each area as a shelf):

Getting Started

• Contains overview of all ODP
• Contains guides on how to sync and build code generally
• How to setup hardware and load builds and validate and test content on various platforms
• Repository overview and organization

Projects

• Keep to one mdbook per project that covers all the high level details of that given project with references to all the relevant repositories
• Should have all the relevant information needed by someone working on a given project on how all the pieces fit together
• Details specific about how to load a repository or compile and repository specific content should go into an mdbook in that specific repository

Tutorials

• Video content should go to the Youtube channel https://www.youtube.com/@OpenDevicePartnership
• Tutorials here can contain pictures and steps to walk people through particular concepts, projects or features. If it is a NOOB tutorial keep it in the Getting Started Section

Specifications

• Reserve this section for publishing specifications that we want to publish to a wider audience

Further investigation needed for linking from books back to libraries and best practices for referencing from one book to another.

[jeffglaum]

Great start! Thank you for putting this together. Minor edit suggestions.

[jeffglaum]

Thanks Phil.

[jerrysxie]

We probably want to squash the commits in this PR since we are not doing automatic squashing as the part of the commit history would be pointing to a forked branch that might or might not exist in the future.