Add alt attribute to images

Author: natikgadzhi

_data/go_further.yml

@@ -3,27 +3,32 @@
   content_type: article
   content_url: /documentation/articles/value-and-reference-types.html
   thumbnail_url: #TBD
+  thumbnail_alt:
   release_date: 2023-04-29
   external: false
 - title: "Generics"
   description: "In Swift, generics are a fundamental way to write abstract code. This video walks through the basics of Swift Generics and introducing generics into your code."
   content_type: video
   content_url: https://developer.apple.com/videos/play/wwdc2022/110352/
   thumbnail_url: /assets/images/getting-started/swift-generics-thumbnail.jpg
+  thumbnail_alt: "A block thumbnail image with three emoji icons: a femail farmer, a cow, and a carrot."
   release_date: 2021-06-09
   external: true
 - title: "Concurrency"
   description: "Swift has concurrency features built into the language making it easier to write concurrent code with the assistance of the compiler. This video introduces the async/await mechanism, a key part of Swift Concurrency."
   content_type: video
   content_url: https://developer.apple.com/videos/play/wwdc2021/10132/
   thumbnail_url: /assets/images/getting-started/meet-async-await-thumbnail.jpg
+  thumbnail_alt: |
+    A thumbnail image describing a concurrent sequence diagram with five blocks: green into yellow into purple into another yello into another green.
   release_date: 2021-06-08
   external: true
 - title: "Regular Expressions"
   description: "Swift provides first-class regular expression support, commonly known as regex, for effective string processing. This video gives an overview of the power and flexibility of Swift Regex."
   content_type: video
   content_url: https://developer.apple.com/videos/play/wwdc2022/110357/
   thumbnail_url: /assets/images/getting-started/regular-expression-thumbnail.jpg
+  thumbnail_alt: "An image describing a block of code about Regular Expression syntax."
   release_date: 2022-06-07
   external: true
 

getting-started/_go-further.md

@@ -6,9 +6,9 @@ Ready to dive deeper? Here are some hand-picked resources covering various Swift
   {% for resource in site.data.go_further %}
   <li class="resource{% if resource.featured %} featured{% endif %}">
       {% if resource.thumbnail_url %}
-        <img class="thumbnail" src="{{ resource.thumbnail_url }}"/>
+        <img class="thumbnail" src="{{ resource.thumbnail_url }}" alt="{{ resource.thumbnail_alt }}"/>
       {% elsif resource.content_type == "article" %}
-        <img class="thumbnail" src="/assets/images/getting-started/article-thumbnail.jpg"/>
+        <img class="thumbnail" src="/assets/images/getting-started/article-thumbnail.jpg" alt="An article icon"/>
       {% endif %}
 
       <h3>{{ resource.title }}</h3>

index.md

@@ -30,14 +30,14 @@ atom: true
 
     <li>
       <a href="/getting-started">
-        <img src="/assets/images/landing-page/signs.svg" />
+        <img src="/assets/images/landing-page/signs.svg" alt="An icon image with a sign post and two signs pointing in opposite directions." />
         Get started
       </a>
     </li>
 
     <li>
       <a href="/documentation">
-        <img src="/assets/images/landing-page/book.svg" />
+        <img src="/assets/images/landing-page/book.svg" alt="An icon image with an open book." />
         Read the docs
       </a>
     </li>