DOC: add link to blog to landing page

Author: tacaswell

docs/_templates/landing_footer.html

@@ -1,6 +1,6 @@
 <footer class="footer-section">
     <div class="grid__mpl-info">
-      <h1>matplotlib</h1>
+      <h1>Matplotlib</h1>
       <ul class="social fas">
         <li>
           <a href="https://github.com/matplotlib/matplotlib" aria-label="Matplotlib on Github">
@@ -38,6 +38,7 @@ <h1>matplotlib</h1>
     </div>
 
     <ul class="mpl-links grid__mpl-links">
+      <li><a href="https://matplotlib.org/matplotblog/">Matplotblog</a></li>
       <li>
         <a
           href="https://github.com/matplotlib/matplotlib/blob/master/CODE_OF_CONDUCT.md"