fix(aio): home & marketing styles cleanup (#17926)

aio/content/marketing/events.html

@@ -2,7 +2,7 @@
   <h1 class="banner-headline no-toc no-anchor">Events</h1>
 </header>
 
-<article class="l-content ">
+<article>
 <p>Where we'll be presenting:</p>
   <table class="is-full-width">
     <thead>

aio/content/marketing/features.html

@@ -2,7 +2,7 @@
   <h1 class="banner-headline no-toc no-anchor">Features & Benefits</h1>
 </header>
 
-<article class="l-content ">
+<article>
   <div class="flex-center">
     <div>
       <div class="feature-section">
@@ -28,6 +28,7 @@
             <p class="text-body">Create desktop-installed apps across Mac, Windows, and Linux using the same Angular methods you've learned for the web plus the ability to access native OS APIs.</p>
           </div>
         </div>
+        <hr>
       </div>
 
       <div class="feature-section">
@@ -52,6 +53,7 @@
             <p class="text-body">Angular apps load quickly with the new Component Router, which delivers automatic code-splitting so users only load code required to render the view they request.</p>
           </div>
         </div>
+        <hr>
       </div>
 
       <div class="feature-section">
@@ -76,6 +78,7 @@
             <p class="text-body">Get intelligent code completion, instant errors, and other feedback in popular editors and IDEs.</p>
           </div>
         </div>
+        <hr>
       </div>
 
       <div class="feature-section">

aio/content/marketing/index.html

@@ -1,5 +1,5 @@
 <!--FULL HEADER BLOCK-->
-<header class="l-relative">
+<header>
 
   <!--BACKGROUND IMAGE-->
   <div class="background-sky hero"></div>
@@ -24,7 +24,7 @@
 
 </header>
 
-<article class="l-content">
+<article>
   <div class="home-rows">
 
     <!--Announcement Bar-->

aio/content/marketing/news.html

@@ -2,7 +2,7 @@
   <h1 class="hero-title no-toc">News</h1>
   <div class="clear"></div>
 </header>
-<article class="l-content ">
+<artice>
   <div class="grid-fluid l-space-bottom-2">
     <div class="c12 text-center"><h3 class="text-headline text-uppercase"> Core Team</h3></div>
     <div class="clear"></div>