Improve accessibility of iframe that displays documents #319
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Resolves #313 . Adds a title attribute to the iframe that the document display page at http://localhost:8080/src/#/document/file/a866e3c1-117b-409a-9816-42636082a89b uses to improve accessibility.
![image](https://user-images.githubusercontent.com/19763542/189253968-05403a19-47bd-441a-8145-05f4f3f1147d.png)
![image](https://user-images.githubusercontent.com/19763542/189253992-6607f389-3d15-40fe-929b-376d36413da5.png)
The Accessibility score increased from 83 to 86.