S3 Bucket mp3/video checks

[mikhael28]

In src/profile/EditProfile, as well as in the Arena Proof Modal, we are submitting items to s3, primarily as images. However, we want to be ready for mp3, video, etc - this ticket revolves around two things.

1. Making sure the s3 bucket can accept those file extensions
2. Open those file extensions inside the application, instead of lazily opening an external link to the s3 URL. Might need to use some HTML tags, that aren't currently there.