Update elevation

crates/ui2/src/styles/docs/elevation.md

@@ -1,27 +1,10 @@
-TODO: Originally sourced from Material Design 3, Rewrite to be more Zed specific
-
 # Elevation
 
-Zed applies elevation to all surfaces and components, which are categorized into levels.
-
-Elevation accomplishes the following:
-- Allows surfaces to move in front of or behind others, such as content scrolling beneath app top bars.
-- Reflects spatial relationships, for instance, how a floating action button’s shadow intimates its disconnection from a collection of cards.
-- Directs attention to structures at the highest elevation, like a temporary dialog arising in front of other surfaces.
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-Elevations are the initial elevation values assigned to components by default.
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-Components may transition to a higher elevation in some cases, like user interations.
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-On such occasions, components transition to predetermined dynamic elevation offsets. These are the typical elevations to which components move when they are not at rest.
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-## Understanding Elevation
-
 Elevation can be thought of as the physical closeness of an element to the user. Elements with lower elevations are physically further away from the user on the z-axis and appear to be underneath elements with higher elevations.
 
 Material Design 3 has a some great visualizations of elevation that may be helpful to understanding the mental modal of elevation. [Material Design – Elevation](https://m3.material.io/styles/elevation/overview)
 
-## Elevation
+## Elevation Levels
 
 1. App Background (e.x.: Workspace, system window)
 1. UI Surface (e.x.: Title Bar, Panel, Tab Bar)
@@ -59,27 +42,3 @@ Modal Surfaces are used for elements that should appear above all other UI eleme
 Elements rendered at this layer have an enforced behavior: Any interaction outside of the modal will either dismiss the modal or prompt an action (Save your progress, etc) then dismiss the modal.
 
 If the element does not have this behavior, it should be rendered at the Elevated Surface layer.
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-## Layer
-Each elevation that can contain elements has its own set of layers that are nested within the elevations.
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-1. TBD (Z -1 layer)
-1. Element (Text, button, surface, etc)
-1. Elevated Element (Popover, Context Menu, Tooltip)
-999. Dragged Element -> Highest Elevation
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-Dragged elements jump to the highest elevation the app can render. An active drag should _always_ be the most foreground element in the app at any time.
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-🚧 Work in Progress 🚧
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-## Element
-Each elevation that can contain elements has it's own set of layers:
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-1. Effects
-1. Background
-1. Tint
-1. Highlight
-1. Content
-1. Overlay
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-🚧 Work in Progress 🚧