Clean up misc large assets from repo

[petele]

The repo has several large, and somewhat unnecessary assets that should be removed (and scrubbed) prior to being moved back to main.

Attached is a list of files to investigate, some can be deleted completed, others can probably be shared/linked instead of creating multiple copies.

wf-files-to-investigate.txt

[jakearchibald]

I haven't tried it, but https://gist.github.com/nk9/b150542ef72abc7974cb may be useful in identifying large files.