[refactor] support React change event for set-edit-content! & fix image style of block conent

src/main/frontend/components/block.css

@@ -0,0 +1,15 @@
+.blocks-container {
+}
+
+.block-content {
+}
+
+.block-children {
+}
+
+.ls-block {
+}
+
+.block-content img {
+  width: 100%;
+}