website: Update homepage

This adds a link to the most recent blog post and the gem5-20 paper
to the homepage.

Signed-off-by: Jason Lowe-Power <jason@lowepower.com>
Change-Id: I1918169d096282f0f3cbafba4bac8294f51b2bc1
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5-website/+/35441
Reviewed-by: Bobby R. Bruce <bbruce@ucdavis.edu>
Maintainer: Bobby R. Bruce <bbruce@ucdavis.edu>
Tested-by: Bobby R. Bruce <bbruce@ucdavis.edu>
diff --git a/index.html b/index.html
index 6ca524e..ded5574 100755
--- a/index.html
+++ b/index.html
@@ -4,6 +4,11 @@
 ---
 <header>
   <img src="{{ "/assets/img/gem5logo/Color/noBackground/vertical/gem5ColorVert.png" | prepend: site.baseurl }}" height="250px;">
+
+  <br/>
+  <a href="{{ site.posts.first.url }}"><button type="button" class="btn btn-primary btn-lg"><b>Latest News:</b> {{ site.posts.first.title }}</button></a>
+  <br/>
+
   <p>
     The gem5 simulator is a modular platform for computer-system architecture research, encompassing system-level architecture as well as processor microarchitecture.
     gem5 is a <i>community led</i> project with an <a href=/governance/>open governance</a> model.
@@ -11,9 +16,11 @@
   <p>
     gem5 was originally conceived for computer architecture research in academia, but it has grown to be used in computer system design by academia, industry for research, and in teaching.
   </p>
+
   <a href="{{ "/getting_started" | prepend: site.baseurl }}"><button type="button" class="btn btn-primary" href="">Get Started</button></a>
   <a href="https://gem5.googlesource.com/public/gem5"><button type="button" class="btn btn-outline-primary">Source</button></a>
   <a href="https://gem5-review.googlesource.com/"><button type="button" class="btn btn-outline-primary">Code Review</button></a>
+  <a href="https://arxiv.org/abs/2007.03152"><button type="button" class="btn btn-outline-primary">gem5-20+ paper</button></a>
 
 
 </header>