Integrate one of the debruijn graph visualisers

Recently discussed in a private slack, someone posted this https://0petya.github.io/debruijn-assembler/ which is nice but doesn't accept spaces so you can't do the classic shakespeare quotes sadly. We should either rewrite or fork something like this eventually because it'd be super nice to have and add to the set of 'games' in the GTN, we could even have an 'educational game center' in the future collecting this + other ones like the murder mystery sql.