Merge pull request #435 from sanjana2505006/chore/a11y-alt-tags

chore: improve accessibility by adding missing alt attributes to images

Author: sbglasius

README.md

@@ -167,7 +167,7 @@ The process to deploy Grails 3.1 applications to JBoss 6.4 EAP is largely simila
 
 If you write often to Grails's blog, we recommend you to create a [Text Expander](https://textexpander.com) snippet:
 
- ![](docs/textexpander.png)
+ ![TextExpander snippet example](docs/textexpander.png)
 
 
 #### Title Metadata
@@ -223,7 +223,7 @@ image: 2018-05-23.jpg
 
 Place the images at `assets/bgimages`
 
-![](docs/blogimages.png)
+![Blog images directory structure](docs/blogimages.png)
 
 ### Tags
 

pages/index.html

@@ -84,7 +84,7 @@ <h3>REST APIs, REACT, ANGULAR</h3>
                     developers to build REST APIs or modern web applications with a JavaScript frontend.</p>
             </div>
             <div class="column">
-                <img src="[%url]/images/plugins.svg" alt="">
+                <img src="[%url]/images/plugins.svg" alt="Grails Plugins Logo">
                 <h3>Plugins</h3>
                 <p>Developers can build plugins that extend and enhance the Grails framework, or they can access
                     existing plugins published by a vibrant plugin community.</p>