Category for Transmog

[mutasDev]

With the addition of collected transmogs to the api, a new category of collected transmogs for the armor types might be possible and nice for the users.

[SolestialDev]

Started working on this but still needs a lot of work, definitely something I'd like to see added as well though.

Couple key points I think are worth mentioning (for anyone who may have suggestions as to how we could approach this);

• Only feasible solution really would be to split appearances by slot, I tried loading them all onto one page but just causes the page to freeze

• I'm having trouble actually linking to the appearance, wowhead has no accessible link for this, I had the idea of grabbing the wowhead link of the first item and then the 'same model as' (https://www.wowhead.com/item=190735/varruths-guillotine#same-model-as) - but I have no idea how we could efficiently add these items to the appearance data

  To actually grab these items you'd need to run every appearance individually through the api to get all items that have that appearance - seems very inefficient and I'm pretty sure we'd get ratelimit issues (there's over 50000 appearances).

• I have no clue how we're ever going to manage to sort these out - especially when it comes to obtainability or even categorization, there's over 50000 unique appearances and a lot of them have no info whatsoever on wowhead.