Currently, logged-out readers no longer see any sidebar at all, so they don't see that. We see a tiny proportion of readers who want to customize their skin, figure out how to do so, and figure out where to leave feedback saying they've done so; there are clearly more that would do this if they could.
This should be made possible, both to be polite to those who have lost their preferred workflow, and to get better empirical data about preferences.
Expectation:
- All readers should be able to see that option.
- If logged out it should take them to a login/account creation screen letting them know that accounts can customize their skin
- Once limited anon preferences are available, it could directly take them to the modal w/ toggleable skin parameters (which may otherwise be hard to find as a small icon in the lower-right).