Add mobile upload support

Allow students to easily upload files from other apps (use web share api) (also directly taking pictures inline) and redesign the mobile UI for the uploading of files

• Redesign mobile UI
• Add support for inline photo uploading
• Add support for web share target to allow for sharing from other apps

https://developer.chrome.com/articles/web-share-target/ https://www.reddit.com/r/vuejs/comments/ndnfh6/how_to_convert_an_existing_vuejs_app_into/