update UNIT product card link (#598)

Author: JTorreG

layouts/index.html

@@ -178,7 +178,7 @@ <h2 style="font-weight: 400; font-size: 1.5em; margin-top: 0px; margin-bottom: 0
         <div class="row justify-content-center">
             <div class="card-deck">
              <div class="col-xs-12 col-sm-6 col-lg-4 card-holder">
-                 <a href="https://unit.nginx.org/" class="products-card" alt="NGINX Unit">
+                 <a href="{{ .Site.BaseURL }}nginx-unit" class="products-card" alt="NGINX Unit">
                      <div class="saas-card">
                          <div class="saas-icon"><img style="width: auto; height: auto;" src="{{ .Site.BaseURL }}/images/icons/NGINX-Unit-product-icon-RGB.png"></div>
                          <div class="saas-description">
@@ -384,7 +384,7 @@ <h1 class="homepage-item-text">
         <div class="homepage-item">
             <div class="homepage-item-heading">
                 <div class="homepage-item-logo">
-                    <img class="card-img-top" src="{{ .Site.BaseURL }}/images/icons/NGINX-for-Azure-product-icon.png"> 
+                    <img class="card-img-top" src="{{ .Site.BaseURL }}/images/icons/NGINX-for-Azure-product-icon.png">
                 </div>
                 <div class="homepage-item-text">
                     NGINX as a Service for Azure
@@ -408,7 +408,7 @@ <h1 class="homepage-item-text">
         <div class="homepage-item">
             <div class="homepage-item-heading">
                 <div class="homepage-item-logo">
-                    <img class="card-img-top" src="{{ .Site.BaseURL }}/images/icons/NGINX-One-product-icon.png"> 
+                    <img class="card-img-top" src="{{ .Site.BaseURL }}/images/icons/NGINX-One-product-icon.png">
                 </div>
                 <div class="homepage-item-text">
                     NGINX Unit