Update docsy to 030c04b86b5705d24945fc4a47da1b700aec9ff3

[chalin]

This eliminates the build warning (google/docsy#901). Here's the site diff:

$ (cd public && git diff)                         

diff --git a/index.html b/index.html
index 73e25a45..e80e985a 100644
--- a/index.html
+++ b/index.html
@@ -217,7 +217,7 @@
 <a id="td-block-1" class="td-offset-anchor"></a>
 <section class="row td-box td-box--white position-relative td-box--gradient td-box--height-auto">
        <div class="container text-center td-arrow-down">
-               <span class="h4 mb-0">
+               <div class="h4 mb-0">
                        
                                <p>OpenTelemetry is a collection of tools, APIs, and SDKs. Use it to instrument,
 generate, collect, and export telemetry data (metrics, logs, and traces) to
@@ -228,7 +228,7 @@ We anticipate general availability soon.</p>
 </blockquote>
 
                        
-               </span>
+               </div>
        </div>
 </section>
 
diff --git a/integrations/index.html b/integrations/index.html
index 50bf36e7..6b5f0440 100644
--- a/integrations/index.html
+++ b/integrations/index.html
@@ -151,12 +151,12 @@ OpenTelemetry integrates with or is integrated into various open source projects
 <a id="td-block-0" class="td-offset-anchor"></a>
 <section class="row td-box td-box--primary position-relative td-box--gradient td-box--height-auto">
        <div class="container text-center td-arrow-down">
-               <span class="h4 mb-0">
+               <div class="h4 mb-0">
                        
                                <h1 id="integrations">Integrations</h1>
 <p>OpenTelemetry integrates with or is integrated into various open source projects.
                        
-               </span>
+               </div>
        </div>
 </section>
 
diff --git a/registry/index.html b/registry/index.html
index 5a026103..89686450 100644
--- a/registry/index.html
+++ b/registry/index.html
@@ -143,12 +143,12 @@ Find libraries, plugins, integrations, and other useful tools for extending Open
 <a id="td-block-0" class="td-offset-anchor"></a>
 <section class="row td-box td-box--primary position-relative td-box--gradient td-box--height-auto">
        <div class="container text-center td-arrow-down">
-               <span class="h4 mb-0">
+               <div class="h4 mb-0">
                        
                                <h1 id="registry">Registry</h1>
 <p>Find libraries, plugins, integrations, and other useful tools for extending OpenTelemetry.
                        
-               </span>
+               </div>
        </div>
 </section>
 
diff --git a/status/index.html b/status/index.html
index adfbacf2..22759ca7 100644
--- a/status/index.html
+++ b/status/index.html
@@ -149,7 +149,7 @@ release for …">
 <a id="td-block-0" class="td-offset-anchor"></a>
 <section class="row td-box td-box--primary position-relative td-box--gradient td-box--height-auto">
        <div class="container text-center td-arrow-down">
-               <span class="h4 mb-0">
+               <div class="h4 mb-0">
                        
                                <h1 id="status-opentelemetry-tracing-specification-now-10">Status: OpenTelemetry Tracing Specification now 1.0!</h1>
 <p>Our goal is to provide a generally available, production quality
@@ -158,7 +158,7 @@ first half of 2021. Several components have already reached this milestone! We
 expect metrics to reach the same status in the second half of 2021 and are
 targeting logs in 2022.
                        
-               </span>
+               </div>
        </div>
 </section>
 
diff --git a/vendors/index.html b/vendors/index.html
index 0f7ca532..090375be 100644
--- a/vendors/index.html
+++ b/vendors/index.html
@@ -149,13 +149,13 @@ products. …">
 <a id="td-block-0" class="td-offset-anchor"></a>
 <section class="row td-box td-box--primary position-relative td-box--gradient td-box--height-auto">
        <div class="container text-center td-arrow-down">
-               <span class="h4 mb-0">
+               <div class="h4 mb-0">
                        
                                <h1 id="vendor-support">Vendor support</h1>
 <p>Distributions and vendors who natively support OpenTelemetry in their commercial
 products.
                        
-               </span>
+               </div>
        </div>
 </section>

These changes are due to google/docsy#907.