fix: make beforeupdate and afterupdate excercise work (sveltejs#176)

svelte.config.js was unnecessary and failed the dev server

Author: ivanbtrujillo

content/tutorial/01-svelte/07-lifecycle/03-update/app-a/src/lib/App.svelte

@@ -103,6 +103,7 @@
 	.eliza span {
 		background-color: #eee;
 		border-radius: 1em 1em 1em 0;
+		color: black;
 	}
 
 	.user span {

content/tutorial/01-svelte/07-lifecycle/03-update/app-a/svelte.config.js

@@ -107,6 +107,7 @@
 	.eliza span {
 		background-color: #eee;
 		border-radius: 1em 1em 1em 0;
+		color: black;
 	}
 
 	.user span {