SEP 29: Include every file in the data tree

At build time all of the documents in the build are assembled inside the data variable. Metadata is added, stats are compiled, options are processed, and a final HTML document is emitted to the filesystem.

I think it might be useful of the scope of what constitutes a document was expanded to include all files involved in a build. The tree could come to include photographs, stylesheets etc

Why though?

• Images could have their dimensions checked and inserted into the HTML markup to avoid pop in.
• It would also become possible to easily see how many of each kind of file were referenced in the site. How many photos are linked to, how many times etc

Objects such as images and PDFs do present an interesting problem: how to attach a UUID to such objects in a way that is idempotent/reproducible, ideally without editing the files themselves.