convert lvgl from submodule to a plain old directory

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-Subproject 0732400e7b564dd0e7dc4a924619d8e19c5b23a
diff --git a/lib/lvgl/docs/get-started/os/rt-thread.md b/lib/lvgl/docs/get-started/os/rt-thread.md
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+# RT-Thread RTOS
+
+<img src="https://raw.githubusercontent.com/RT-Thread/rt-thread/master/documentation/figures/logo.png" width=40% style="float: center;" >
+
+## What is RT-Thread?
+
+[Introduce about RT-Thread and how to run LVGL on RT-Thread in simulators](https://www.youtube.com/watch?v=k7QYk6hSwnc)
+
+[**RT-Thread**](https://www.rt-thread.io/) is an [open source](https://github.com/RT-Thread/rt-thread), neutral, and community-based real-time operating system (RTOS). RT-Thread has **Standard version** and **Nano version**. For resource-constrained microcontroller (MCU) systems, the Nano version that requires only 3 KB Flash and 1.2 KB RAM memory resources can be tailored with easy-to-use tools. For resource-rich IoT devices, RT-Thread can use the **online software package** management tool, together with system configuration tools, to achieve intuitive and rapid modular cutting, seamlessly import rich software packages; thus, achieving complex functions like Android's graphical interface and touch sliding effects, smart voice interaction effects, and so on.
+
+### Key features
+
+- Designed for resource-constrained devices, the minimum kernel requires only 1.2KB of RAM and 3 KB of Flash.
+- A variety of standard interfaces, such as POSIX, CMSIS, C++ application environment.
+- Has rich components and a prosperous and fast growing <a href="https://packages.rt-thread.org/en/">package ecosystem</a>
+- Elegant code style, easy to use, read and master.
+- High Scalability. RT-Thread has high-quality scalable software architecture, loose coupling, modularity, is easy to tailor and expand.
+- Supports high-performance applications.
+- Supports all mainstream compiling tools such as GCC, Keil and IAR.
+- Supports a wide range of <a href="https://www.rt-thread.io/board.html">architectures and chips</a>.
+
+
+## How to run LVGL on RT-Thread?
+
+[中文文档](https://www.rt-thread.org/document/site/#/rt-thread-version/rt-thread-standard/packages-manual/lvgl-docs/introduction)
+
+LVGL has registered as a [software package](https://packages.rt-thread.org/en/detail.html?package=LVGL) of RT-Thread. By using [Env tool](https://www.rt-thread.io/download.html?download=Env) or [RT-Thread Studio IDE](https://www.rt-thread.io/download.html?download=Studio), RT-Thread users can easily download LVGL source code and combine with RT-Thread project. RT-Thread community has port LVGL to several BSPs:
+
+| BSP                                                          | Note |
+| ------------------------------------------------------------ | ---- |
+| [QEMU simulator](https://github.com/RT-Thread/rt-thread/tree/master/bsp/qemu-vexpress-a9/applications/lvgl) |      |
+| [Visual Studio simulator](https://github.com/RT-Thread/rt-thread/tree/master/bsp/simulator/applications/lvgl) |      |
+| [Nuvoton numaker-iot-m487](https://github.com/RT-Thread/rt-thread/tree/master/bsp/nuvoton/numaker-iot-m487/applications/lvgl) |      |
+| [Nuvoton numaker-pfm-m487](https://github.com/RT-Thread/rt-thread/tree/master/bsp/nuvoton/numaker-pfm-m487/applications/lvgl) |      |
+| [Nuvoton nk-980iot](https://github.com/RT-Thread/rt-thread/tree/master/bsp/nuvoton/nk-980iot/applications/lvgl) |      |
+| [Nuvoton numaker-m2354](https://github.com/RT-Thread/rt-thread/tree/master/bsp/nuvoton/numaker-m2354/applications/lvgl) |      |
+| [Nuvoton nk-n9h30](https://github.com/RT-Thread/rt-thread/tree/master/bsp/nuvoton/nk-n9h30/applications/lvgl) |      |
+| [Nuvoton numaker-m032ki](https://github.com/RT-Thread/rt-thread/tree/master/bsp/nuvoton/numaker-m032ki/applications/lvgl) |      |
+| [NXP imxrt1060-evk](https://github.com/RT-Thread/rt-thread/tree/master/bsp/imxrt/imxrt1060-nxp-evk/applications/lvgl) |      |
+| [STM32L475 pandora](https://github.com/RT-Thread/rt-thread/tree/master/bsp/stm32/stm32l475-atk-pandora/applications/lvgl) |      |
+| [STM32F407 explorer](https://github.com/RT-Thread/rt-thread/tree/master/bsp/stm32/stm32f407-atk-explorer/applications/lvgl) |      |
+| [STM32F469 Discovery](https://github.com/RT-Thread/rt-thread/tree/master/bsp/stm32/stm32f469-st-disco/applications/lvgl) |      |
+| [Raspberry PICO](https://github.com/RT-Thread/rt-thread/tree/master/bsp/raspberry-pico/applications/lvgl) |      |
+
+
+### Import a BSP project into RT-Thread Studio
+
+Clone the latest code from RT-Thread official repository. Open the RT-Thread Studio and select `File -> Import`. In the Import menu, please select `RT-Thread BSP Project into Workspace`, and click `next` button. In the `BSP location area`, please select the root path of the BSP which you prefer to import, such as `C:\Users\xxx\Desktop\rt-thread\bsp\stm32\stm32l475-atk-pandora`. In the `Project Name area`, please type a name for this project, then, press `Finish` button.