Better theme settings on user front-end

[david (David Taylor)]

We’re still planning user-selectable theme preferences for the future, but per-user font size selection is now part of core:

We need a "large fonts" and "small fonts" theme to ship with Discourse

Per-user font size selection is now part of Discourse. You’ll find the setting under your interface preferences. https://github.com/discourse/discourse/commit/1ebd3dbbd02a684b139e74b53d0545f15d78a1af