add about page

src/pages/docs/about.mdx

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+---
+layout: "@layouts/GuideMdLayout.astro"
+title: "About Quickshell"
+---
+# {frontmatter.title}
+Quickshell is a toolkit for building a desktop shell, which is to say components
+of your desktop like bars, widgets, lock screens, display managers, and the like.
+
+Quickshell is based on QtQuick and configured with QML, the QtQuick interface
+description language. It provides integrations for common shell functionality,
+as well as support for hot reloading and tools to work with processes,
+sockets, files, and more.
+
+Built-in integrations are currently provided for:
+- Wayland and X11 for windowing
+- Wayland for window management and screen recording
+- Workspace management in Hyprland, I3, and Sway
+- Pipewire for audio controls
+- Pam for authentication and building lockscreens
+- Greetd for building a display manager
+- UPower for monitoring battery statistics
+- Power Profiles Daemon
+- MPRIS compatible media players
+- StatusNotifierItem compatible system tray clients
+
+Quickshell is actively developed and will still receive breaking changes.
+A tagged release is planned soon, however there will be breakage before
+that point.
+
+See the [Usage Guide](/docs/guide) to learn how to set up and use Quickshell