Video/Audio NFT support

Currently we assume all NFTs are image based and do not support other types of media (though we link to them).
A couple of scenarios to consider:

1. OpenSea currently provides us a snapshot image even when an NFT is actually a video, but when a user imports an NFT and have OpenSea turned off we are displaying nothing.

2. Again if we don't have a snapshot from OpenSea because the user has turned off the OpenSea API **AND** the original image is hosted on a protocol like IPFS where the file type is not accessible from the URL we cannot know before hand whether it is an image or video/audio and therefore cannot know what tag (`` or ``) to pass it to. There may be [ways to extract the file type programmatically](https://github.com/ipfs/js-ipfs/issues/3473) from the ipfs url, but this will require some further research.