Document the Overview and other new things

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+### Overview
+
+<sup>Since: next release</sup>
+
+The Overview is a zoomed-out view of your workspaces and windows.
+It lets you see what's going on at a glance, navigate, and drag windows around.
+
+Open it with the `toggle-overview` bind, via the top-left hot corner, or via a touchpad four-finger swipe up.
+While in the overview, all keyboard binds keep working, while pointing devices get easier:
+
+- Mouse: left click for interactive-move, right click to scroll a workspace left/right (no holding Mod required).
+- Touchpad: two-finger scrolling that matches the normal three-finger gestures.
+- Touchscreen: one-finger scrolling, or one-finger long press for interactive move.
+
+> [!TIP]
+> The overview needs to draw a background under every workspace.
+> So, layer-shell surfaces work this way: the *background* and *bottom* layers zoom out and remain under workspaces, while the *top* and *overlay* layers remain on top of the overview.
+>
+> Put your bar on the *top* layer.
+
+Drag-and-drop will scroll the workspaces up/down in the overview, and will activate a workspace if you hold it above for a moment.
+Combined with the hot corner, this lets you do a mouse-only DnD across workspaces.
+
+https://github.com/user-attachments/assets/5f09c5b7-ff40-462b-8b9c-f1b8073a2cbb
+
+You can also drag-and-drop a window to a new workspace above, below, or in-between existing workspaces.
+
+https://github.com/user-attachments/assets/b76d5349-aa20-4889-ab90-0a51554c789d
+
+### Configuration
+
+Overview settings are in the [`overview`](./Configuration:-Miscellaneous.md#overview) section at the top level of the config.
+
+You can set the zoom-out level like this:
+
+```kdl
+// Make workspaces four times smaller than normal in the overview.
+overview {
+    zoom 0.25
+}
+```
+
+You can also disable the hot corner:
+
+```kdl
+// Disable the hot corners.
+gestures {
+    hot-corners {
+        off
+    }
+}
+```