convert lvgl from submodule to a plain old directory

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diff --git a/lib/lvgl b/lib/lvgl
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-Subproject 0732400e7b564dd0e7dc4a924619d8e19c5b23a
diff --git a/lib/lvgl/docs/libs/qrcode.md b/lib/lvgl/docs/libs/qrcode.md
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+
+# QR code
+
+QR code generation with LVGL. Uses [QR-Code-generator](https://github.com/nayuki/QR-Code-generator) by [nayuki](https://github.com/nayuki).
+
+## Get started
+- Download or clone this repository
+  - [Download](https://github.com/lvgl/lv_lib_qrcode.git) from GitHub
+  - Clone: git clone https://github.com/lvgl/lv_lib_qrcode.git
+- Include the library: `#include "lv_lib_qrcode/lv_qrcode.h"`
+- Test with the following code:
+```c
+const char * data = "Hello world";
+
+/*Create a 100x100 QR code*/
+lv_obj_t * qr = lv_qrcode_create(lv_scr_act(), 100, lv_color_hex3(0x33f), lv_color_hex3(0xeef));
+
+/*Set data*/
+lv_qrcode_update(qr, data, strlen(data));
+```
+
+## Notes
+- QR codes with less data are smaller, but they scaled by an integer number to best fit to the given size.
+
+
+## Example
+```eval_rst
+
+.. include:: ../../examples/libs/qrcode/index.rst
+
+```
+
+## API
+
+```eval_rst
+
+.. doxygenfile:: lv_qrcode.h
+  :project: lvgl