CCM-5769: fix alt text (#41)

* CCM-5769: fix alt text

* CCM-5769: update accessibility alerts

Author: bhansell1

docs/.pa11y-ci.js

@@ -26,9 +26,13 @@ module.exports = {
     chromeLaunchConfig: {
       args: ['--no-sandbox']
     },
+    rules: [
+      'Principle1.Guideline1_3.1_3_1_AAA',
+    ],
     useIncognitoBrowserContext: false,
     standard: 'WCAG2AA',
     userAgent: 'pa11y-ci',
+    concurrency: 8,
   },
   urls: getUrlsFromSiteMap()
 };;

docs/_data/home/heading.yml

@@ -3,5 +3,4 @@ description: |
   You can use NHS Notify if you work in NHS England and support direct care.
 image: landing-main-image.svg
 image_alt: |
-  A graphic representation of NHS Notify's message channels:
-  NHS App messages, emails, text messages and letters.
+  A graphic representation of NHS Notify's message channels: NHS App, email, text message and letter.

docs/_data/home/how-it-works.yml

@@ -24,4 +24,4 @@
   description: |
     Track how many messages you've sent and find out which ones are not being delivered.
   image: 4-see-message-performance.svg
-  image_alt: Track how many messages you've sent and find out which ones are not being delivered.
+  image_alt: A screenshot of NHS Notify showing counts of NHS App messages and text messages that have been sent.

docs/_layouts/page.html

@@ -48,7 +48,7 @@
           </div>
           <div class="nhsnotify-pane__main-content nhsuk-grid-column-three-quarters">
             {% if page.section != undefined %}
-            <p class="nhsuk-heading-s" style="margin-bottom: 0; color: #4c6272">{{ page.section }}</p>
+            <heading class="nhsuk-heading-s" style="margin-bottom: 0; color: #4c6272">{{ page.section }}</heading>
             {% endif %}
             <h1>{{ page.title }}</h1>
             {{ content }}