added changelog and version dropdown

src/pages/docs/about.mdx

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----
-layout: "@layouts/GuideMdLayout.astro"
-title: "About Quickshell"
----
-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
-- BlueZ for bluetooth
-- 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
-
-## Is Quickshell for me?
-#### I want a preconfigured desktop
-There are many setups intended to be useful without much tweaking, for example:
-- [Caelestia](https://github.com/caelestia-dots/shell) by Soramane
-- [Illogical-Impulse](https://github.com/end-4/dots-hyprland) by end_4.
-
-#### I want to make my own
-Quickshell is a relatively low-level tool compared to simple status bars like Waybar.
-When writing a Quickshell configuration, you are not just changing styles and layouts, but
-practically programming, which is considerably more complex.
-
-You can see the [QML Language Reference](/docs/guide/qml-language) to get an idea
-of what you're getting into.
-> [!tip/NEXT STEPS]
-> See the [Usage Guide](/docs/guide) to learn how to set up and use Quickshell.