fix: add missing alt attributes to images for accessibility

Signed-off-by: immanuwell <pchpr.00@list.ru>

Author: immanuwell

_includes/footer.html

@@ -4,7 +4,8 @@
       <img
         class="cncf"
         src="{{ "/images/cncf.png" | relative_url }}"
-        srcset="{{ "/images/cncf@2x.png" | relative_url }} 2x, {{ "/images/cncf@3x.png" | relative_url }} 3x" />
+        srcset="{{ "/images/cncf@2x.png" | relative_url }} 2x, {{ "/images/cncf@3x.png" | relative_url }} 3x"
+        alt="Cloud Native Computing Foundation" />
     </a>
     <p>We are a Cloud Native Computing Foundation graduated project.</p>
   </div>

index.html

@@ -12,7 +12,7 @@ <h1>Open-Source,<br />Cloud-Native Storage for Kubernetes</h1>
             <a class="button" href="{{ gettingStartedLink }}">Try it out now</a>
         </div>
         <div class="col-7_md-12_md-first">
-            <img src="{{ "/images/index-hero.svg" | relative_url }}" />
+            <img src="{{ "/images/index-hero.svg" | relative_url }}" alt="" />
         </div>
     </section>
     <section class="grid-middle">
@@ -22,7 +22,7 @@ <h1>What is Rook?</h1>
     </section>
     <section class="grid-middle">
         <div class="col-6_md-12">
-            <img src="{{ "/images/index-what-is-rook.svg" | relative_url }}" />
+            <img src="{{ "/images/index-what-is-rook.svg" | relative_url }}" alt="" />
         </div>
         <div class="col-6_md-12">
             <h2>Storage Operators for Kubernetes</h2>
@@ -77,35 +77,35 @@ <h1 class="text-center">Features of Rook</h1>
     </section>
     <section class="grid-bottom features">
         <div class="col-3_xs-6">
-            <img class="automate" src="{{ "/images/features/automate.svg" | relative_url }}" />
+            <img class="automate" src="{{ "/images/features/automate.svg" | relative_url }}" alt="" />
             <span>Simple and reliable automated storage management</span>
         </div>
         <div class="col-3_xs-6">
-            <img class="scale" src="{{ "/images/features/scale.svg" | relative_url }}" />
+            <img class="scale" src="{{ "/images/features/scale.svg" | relative_url }}" alt="" />
             <span>Hyper-scale or hyper-converge your storage clusters</span>
         </div>
         <div class="col-3_xs-6">
-            <img class="distribute" src="{{ "/images/features/distribute.svg" | relative_url }}" />
+            <img class="distribute" src="{{ "/images/features/distribute.svg" | relative_url }}" alt="" />
             <span>Efficiently distribute and replicate data to minimize loss</span>
         </div>
         <div class="col-3_xs-6">
-            <img class="provision" src="{{ "/images/features/provision.svg" | relative_url }}" />
+            <img class="provision" src="{{ "/images/features/provision.svg" | relative_url }}" alt="" />
             <span>Provision, file, block, and object storage</span>
         </div>
         <div class="col-3_xs-6">
-            <img class="manage" src="{{ "/images/features/manage.svg" | relative_url }}" />
+            <img class="manage" src="{{ "/images/features/manage.svg" | relative_url }}" alt="" />
             <span>Manage open-source Ceph storage</span>
         </div>
         <div class="col-3_xs-6">
-            <img class="elasticstorage" src="{{ "/images/features/elasticstorage.svg" | relative_url }}" />
+            <img class="elasticstorage" src="{{ "/images/features/elasticstorage.svg" | relative_url }}" alt="" />
             <span>Easily enable elastic storage in your datacenter</span>
         </div>
         <div class="col-3_xs-6">
-            <img class="opensource" src="{{ "/images/features/opensource.svg" | relative_url }}" />
+            <img class="opensource" src="{{ "/images/features/opensource.svg" | relative_url }}" alt="" />
             <span>Open source software released under the Apache 2.0 license</span>
         </div>
         <div class="col-3_xs-6">
-            <img class="optimize" src="{{ "/images/features/optimize.svg" | relative_url }}" />
+            <img class="optimize" src="{{ "/images/features/optimize.svg" | relative_url }}" alt="" />
             <span>Optimize workloads on commodity hardware</span>
         </div>
     </section>

support.html

@@ -19,7 +19,7 @@ <h1>Support</h1>
             </p>
         </div>
         <div class="col-7_md-12_md-first">
-            <img src="{{ "/images/index-what-is-rook.svg" | relative_url }}" />
+            <img src="{{ "/images/index-what-is-rook.svg" | relative_url }}" alt="" />
         </div>
     </section>
     <section class="grid-middle">