Update homepage

Signed-off-by: Jason Lowe-Power <jason@lowepower.com>
diff --git a/_sass/_layout.scss b/_sass/_layout.scss
index 818a078..d09a756 100755
--- a/_sass/_layout.scss
+++ b/_sass/_layout.scss
@@ -206,15 +206,12 @@
 	min-height: 320px;
 	margin: auto;
 	margin-top: 5rem;
-	padding-top: 65px;
 	box-shadow: 0 4px 8px 0 rgba(0,0,0,0.2);
 	transition: 0.3s;
 	border-radius: 5px;
 
   div.fav {
-		left: 6rem;
-		top: -2.8rem;
-		position: absolute;
+    margin: -2.8rem auto;
 		background-color: white;
 		padding: 0px 18px;
 		border-radius: 50px;
@@ -225,17 +222,29 @@
 	}
 
 	h5.card-title {
-		text-transform: uppercase;
+    text-transform: uppercase;
+    margin-top: 2.8rem;
 		color: $main;
 		font-weight: 600;
 		font-size: 1.4rem;
-	}
+  }
+
+  img {
+    max-width: 200px;
+    max-height: 200px;
+    display: block;
+    margin: auto;
+  }
 }
 
 div.card:hover {
 		box-shadow: 0 8px 12px 0 rgba(0,0,0,0.2);
 }
 
+div.card-body {
+  text-align: center;
+}
+
 
 
 div.toc {
@@ -395,3 +404,10 @@
 @media (max-width: 576px) {
   body {margin-bottom: 575}
 }
+
+/***** SPECIAL THINGS ****/
+div.sponsor-ask {
+  text-align: center;
+  font-size: larger;
+  margin-top: 2rem;
+}
diff --git a/assets/img/external_logos/nsf.png b/assets/img/external_logos/nsf.png
new file mode 100644
index 0000000..e636880
--- /dev/null
+++ b/assets/img/external_logos/nsf.png
Binary files differ
diff --git a/index.html b/index.html
index 35e919a..00f049c 100755
--- a/index.html
+++ b/index.html
@@ -35,18 +35,18 @@
 
     <div class="col">
       <div class="card">
-        <div class="fav"><i class="fa fa-envelope"></i></div>
+        <div class="fav"><i class="fa fa-graduation-cap"></i></div>
         <div class="card-body">
           <h5 class="card-title">Learning gem5</h5>
           <p class="card-text">Learn how to use gem5 and interact with the gem5 codebase.</p>
-          <a href="/introduction" class="btn btn-primary">Go to Learning Gem5</a>
+          <a href="/introduction" class="btn btn-primary">Go to Learning gem5</a>
         </div>
       </div>
     </div>
 
     <div class="col">
       <div class="card">
-        <div class="fav"><i class="fa fa-envelope"></i></div>
+        <div class="fav"><i class="fa fa-code-fork"></i></div>
         <div class="card-body">
           <h5 class="card-title">Contributing</h5>
           <p class="card-text">Aid the gem5 project by becoming a contributor!</p>
@@ -57,7 +57,7 @@
 
     <div class="col">
       <div class="card">
-        <div class="fav"><i class="fa fa-envelope"></i></div>
+        <div class="fav"><i class="fa fa-book"></i></div>
         <div class="card-body">
           <h5 class="card-title">Publications</h5>
           <p class="card-text">We're always happy to have people cite our work. See our publication list to see how gem5 is aiding computer architecture research.</p>
@@ -68,15 +68,46 @@
 
     <div class="col">
       <div class="card">
-        <div class="fav"><i class="fa fa-envelope"></i></div>
+        <div class="fav"><i class="fa fa-newspaper-o"></i></div>
         <div class="card-body">
           <h5 class="card-title">Blog</h5>
           <p class="card-text">Keep up-to-date with the latest gem5 news via our blog!</p>
-          <a href="/blog" class="btn btn-primary">Go to the blog</a>
+          <a href="/blog" class="btn btn-primary">Go to Blog</a>
+        </div>
+      </div>
+    </div>
+
+    <div class="col">
+      <div class="card">
+        <div class="fav"><i class="fa fa-bug"></i></div>
+        <div class="card-body">
+          <h5 class="card-title">Issue Tracker</h5>
+          <p class="card-text">View the latest gem5 bug reports or add your own!</p>
+          <a href="https://gem5.atlassian.net" class="btn btn-primary">Go to Issue Tracker</a>
         </div>
       </div>
     </div>
 
   </div>
 
+  <br><br>
+  <hr>
+
+  <h1 class="title"> Sponsors </h1>
+
+  <div class="sponsor-ask">
+    <a href="mailto:jlowepower@ucdavis.edu" class="btn btn-primary">Add your company to this list!</a>
+  </div>
+
+  <div class="col">
+    <div class="card">
+      <div class="card-body">
+          <a href="https://www.nsf.gov"><img src="assets/img/external_logos/nsf.png" alt="NSF logo"></a>
+          <a href="https://www.nsf.gov/awardsearch/showAward?AWD_ID=1925724">NSF award number CNS 1925724</a>
+        </div>
+      </div>
+    </div>
+
+
 </div>
+