updated folder structure to simply discovery and contributions

[thegovind]

• As discussed with @lynn-orrell, updated folder structure to simplify discovery and improve contributions.

[lynn-orrell]

What do you think about having /assets at the root for graduated code (production, whatever you want to call it) and also an assets folder under the sandbox directory for assets we may want to refer to for sandboxed stuff?

[thegovind]

What do you think about having /assets at the root for graduated code (production, whatever you want to call it) and also an assets folder under the sandbox directory for assets we may want to refer to for sandboxed stuff?

Agree. Moved assets from sandbox to parent

[lynn-orrell]

/lgtm