example: remove the MicroPython examples

See #4347

examples/widgets/imagebutton/lv_example_imagebutton_1.py

@@ -1,67 +0,0 @@
-# Create an image from the png file
-try:
-    with open('../../assets/imgbtn_left.png','rb') as f:
-        imagebutton_left_data = f.read()
-except:
-    print("Could not find imagebutton_left.png")
-    sys.exit()
-
-imagebutton_left_dsc = lv.image_dsc_t({
-  'data_size': len(imagebutton_left_data),
-  'data': imagebutton_left_data
-})
-
-try:
-    with open('../../assets/imgbtn_mid.png','rb') as f:
-        imagebutton_mid_data = f.read()
-except:
-    print("Could not find imagebutton_mid.png")
-    sys.exit()
-
-imagebutton_mid_dsc = lv.image_dsc_t({
-  'data_size': len(imagebutton_mid_data),
-  'data': imagebutton_mid_data
-})
-
-try:
-    with open('../../assets/imgbtn_right.png','rb') as f:
-        imagebutton_right_data = f.read()
-except:
-    print("Could not find imgtn_right.png")
-    sys.exit()
-
-imagebutton_right_dsc = lv.image_dsc_t({
-  'data_size': len(imagebutton_right_data),
-  'data': imagebutton_right_data
-})
-
-# Create a transition animation on width transformation and recolor.
-tr_prop = [lv.STYLE.TRANSFORM_WIDTH, lv.STYLE.IMAGE_RECOLOR_OPA, 0]
-tr = lv.style_transition_dsc_t()
-tr.init(tr_prop, lv.anim_t.path_linear, 200, 0, None)
-
-style_def = lv.style_t()
-style_def.init()
-style_def.set_text_color(lv.color_white())
-style_def.set_transition(tr)
-
-# Darken the button when pressed and make it wider
-style_pr = lv.style_t()
-style_pr.init()
-style_pr.set_image_recolor_opa(lv.OPA._30)
-style_pr.set_image_recolor(lv.color_black())
-style_pr.set_transform_width(20)
-
-# Create an image button
-imagebutton1 = lv.imagebutton(lv.screen_active())
-imagebutton1.set_src(lv.imagebutton.STATE.RELEASED, imagebutton_left_dsc, imagebutton_mid_dsc, imagebutton_right_dsc)
-imagebutton1.add_style(style_def, 0)
-imagebutton1.add_style(style_pr, lv.STATE.PRESSED)
-
-imagebutton1.align(lv.ALIGN.CENTER, 0, 0)
-
-# Create a label on the image button
-label = lv.label(imagebutton1)
-label.set_text("Button")
-label.align(lv.ALIGN.CENTER, 0, -4)
-