[a11y] About CCA as decorative (Closes #325)

src/views/about.html

@@ -11,7 +11,7 @@
       <h1 id="header-main">Colour Contrast Analyser (CCA)</h1>
       <div class="center">
         <p><span id="i18n-version">Version</span> <span id="cca-version"></span></p>
-        <img src="icons/cca.svg" width="100" height="100" alt="CCA icon" />
+        <img src="icons/cca.svg" width="100" height="100" alt="" />
         <p><span id="i18n-developed">Developed by</span> <a href="https://www.tpgi.com" class="external-link">TPGi</a><br/>Under <a href="https://raw.githubusercontent.com/ThePacielloGroup/CCAe/main/LICENSE" class="external-link">GNU GPL v3.0</a></p>
         <p>The funding for the original WCAG version of the Colour Contrast tool was provided by the Trace Center under grant #H133E030012 from the National Institute on Disability and Rehabilitation Research (NIDRR). However no endorsement of the work by NIDILR should be inferred.</p>  
       </div>