Removed placeholder image, updated readme

src/WPStrava.php

@@ -215,14 +215,6 @@ class WPStrava {
 			filemtime( WPSTRAVA_PLUGIN_DIR . 'build/style.css' )
 		);
 
-		wp_localize_script(
-			'wp-strava-block',
-			'wpStrava',
-			array(
-				'placeholderActivityImg' => WPSTRAVA_PLUGIN_URL . 'images/example-activity.png',
-			)
-		);
-
 		foreach ( $blocks as $block_class ) {
 			$block = new $block_class();
 			$block->register_block();

src/blocks/activity/edit.js

@@ -9,14 +9,6 @@ const { PanelBody, ToggleControl } = wp.components;
 const { isEmpty } = lodash;
 const { serverSideRender: ServerSideRender } = wp;
 
-
-/**
- * Localized Data.
- */
-const {
-	placeholderActivityImg,
-} = wpStrava;
-
 class Edit extends Component {
 
 	constructor() {