fix(index): typos

Author: adrigzr

addon/.gitkeep

@@ -29,7 +29,7 @@
 				<div class="navbar-item">
 					<div class="buttons">
 						<a class="button" href="https://github.com/BBVAEngineering/ember-cli-web-components">
-							<strong>GiHub</strong>
+							<strong>GitHub</strong>
 						</a>
 					</div>
 				</div>
@@ -42,13 +42,13 @@
 			<h1 class="title">This is not an Ember App!</h1>
 			<h2 class="subtitle">Some examples...</h2>
 			<div class="columns">
-				<div class="column is-half">
+				<div class="column">
 					<div class="box">
 						<p class="subtitle">&lt;my-component/&gt;</p>
 						<my-component>This is a Web Component!</my-component>
 					</div>
 				</div>
-				<div class="column is-half">
+				<div class="column">
 					<div class="box">
 						<p class="subtitle">&lt;my-increment/&gt;</p>
 						<my-increment/>