convert lvgl from submodule to a plain old directory

lib/lvgl/docs/widgets/extra/animimg.md

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+# Animation Image (lv_animimg)
+
+## Overview
+
+The animation image is similar to the normal 'Image' object. The only difference is that instead of one source image, you set an array of multiple source images.
+
+You can specify a duration and repeat count.
+
+
+## Parts and Styles
+- `LV_PART_MAIN` A background rectangle that uses the typical background style properties and the image itself using the image style properties.
+
+
+## Usage
+
+### Image sources
+To set the image in a state, use the `lv_animimg_set_src(imgbtn, dsc[], num)`.
+
+
+## Events
+No special events are sent by image objects.
+
+See the events of the Base object too.
+
+Learn more about [Events](/overview/event).
+
+
+## Keys
+No Keys are processed by the object type.
+
+Learn more about [Keys](/overview/indev).
+
+
+## Example
+
+```eval_rst
+
+.. include:: ../../../examples/widgets/animimg/index.rst
+
+```
+
+## API
+
+```eval_rst
+
+.. doxygenfile:: lv_animimg.h
+  :project: lvgl
+
+```