message: make images aria hidden because they are being used as icons
diff: <ul class="connect-links">
  <li id="connect-twitter-link">
  <a href={{$tweetLink}} target="_blank">
  - <img alt="Twitter" src="/assets/community/sidebar/twitter.svg" />
  + <img aria-hidden="true" alt="Twitter" src="/assets/community/sidebar/twitter.svg" />
  Tweet this link
  </a>
  </li>
  <li id="connect-rssfeed">
  <a href="/index.xml" target="_blank">
  - <img alt="RSS" src="/assets/community/sidebar/rss.svg" />
  + <img aria-hidden="true" alt="RSS" src="/assets/community/sidebar/rss.svg" />
  Subscribe
  </a>
  </li>
  <li id="connect-stack-overflow">
  <a href="https://stackoverflow.com/questions/tagged/fluid-framework" target="_blank">
  - <img alt="Stackoverflow" src="/assets/community/sidebar/stackoverflow.svg" />
  + <img aria-hidden="true" alt="Stackoverflow" src="/assets/community/sidebar/stackoverflow.svg" />
  Ask questions
  </a>
  </li>
  <li id="connect-twitter">
  <a href="https://twitter.com/{{.Site.Params.Twitterhandle}}" target="_blank">
  - <img alt="Twitter" src="/assets/community/sidebar/twitter.svg" />
  + <img aria-hidden="true" alt="Twitter" src="/assets/community/sidebar/twitter.svg" />
  @{{.Site.Params.Twitterhandle}}
  </a>
  </li>
  {{- $editUrl = delimit (slice "https://github.com/" $editUrl) "" -}}
  <li id="connect-editpage">
  <a href="{{$editUrl}}" target="_blank">
  - <img alt="Issues" src="/assets/community/sidebar/github.svg" />
  + <img aria-hidden="true" alt="Issues" src="/assets/community/sidebar/github.svg" />
  Edit this page
  </a>
  </li>
  {{- end -}}
  <li id="connect-github">
  <a href="https://www.github.com/{{.Site.Params.Githubrepo}}/issues/new/choose" target="_blank">
  - <img alt="Issues" src="/assets/community/sidebar/issue.svg" />
  + <img aria-hidden="true" alt="Issues" src="/assets/community/sidebar/issue.svg" />
  Report issues
  </a>
  </li>
  