[Feature Request] Log instructions for docs

[scosman]

It would be good to have instructions in our docs for how to get Kiln error logs. Unfortunately I have no idea where/if pyinstaller logs errors to. It's easy to get these in development mode, but most users won't have those.

We should either add:

• instructions for how to get the logs on each platform (Win/Mac/Linux)
• code to save them to files (error level) if pyinstaller doesn't do this by default, including ensuring we don't take up too much disk.

Help would be great on this one.