docs(widgets) begin adding support for building live examples

scripts/build_html_examples.sh

@@ -0,0 +1,15 @@
+#!/bin/bash
+set -e
+CURRENT_REF="$(git rev-parse HEAD)"
+rm -rf emscripten_builder
+git clone https://github.com/lvgl/lv_sim_emscripten.git emscripten_builder
+scripts/genexamplelist.sh > emscripten_builder/examplelist.c
+cd emscripten_builder
+git submodule update --init -- lvgl
+cd lvgl
+git checkout $CURRENT_REF
+cd ..
+git submodule update --init -- lv_drivers
+make -j$(nproc) CHOSEN_DEMO=lv_example_noop || exit 1
+cd ..
+cp -a emscripten_builder/build docs/_static/built_lv_examples