Re: [w3c/manifest] Add support for defining a theme color for both light & dark modes (prefers color scheme) (#975)

We're into bikeshed town! Let's go.

> makes it clear that this is for changing existing values via "overrides" (and also draws the connection to `display_overrides`).

The "overrides" has slightly different meaning in those two contexts:

- `display_override` is essentially us cleaning up our past mistakes. It lets you put new values in front of `display`, values which aren't allowed in `display` for backwards-compatibility reasons. `"display_override": ["tabbed"]` says "I _always_ want `display` to be `"tabbed"`, if that's supported; otherwise fall back to `display`."
- `media_override` (if that's what we call it) lets you override the top-level stated value for members like `theme_color`, with values that would _also_ be valid in the top level, but under user-chosen conditions. `"media_override": {"prefers_color_scheme": "light", "theme_color": "white"}` says "I want `theme_color` to be `"white"` under certain conditions."

I think the word "override" makes sense to both of these, but they aren't analogous to each other, so I would try to avoid overloading that term.

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