Use MCHeads instead of Crafatar (#181)

* Update landing.js

This changes the Skin/Avatar server displayed on the landing page to one that displays the hat layer which then features the skin correctly.

* Create landing.js

This changes the Skin/Avatar server displayed on the landing page to one that displays the hat layer which then features the skin correctly.

* Updated remaining Crafatar URLS

Changed Crafatar URLS to matching mc-heads url.

app/assets/js/scripts/overlay.js

@@ -299,7 +299,7 @@ function populateAccountListings(){
     let htmlString = ''
     for(let i=0; i<accounts.length; i++){
         htmlString += `<button class="accountListing" uuid="${accounts[i].uuid}" ${i===0 ? 'selected' : ''}>
-            <img src="https://crafatar.com/renders/head/${accounts[i].uuid}?scale=2&default=MHF_Steve&overlay">
+            <img src="https://mc-heads.net/head/${accounts[i].uuid}/40">
             <div class="accountListingName">${accounts[i].displayName}</div>
         </button>`
     }