Remove "Allo" filter as we do not offer Sparky SBC iamges anymore

Author: MichaIng

index.html

@@ -214,7 +214,6 @@ <h1>Download</h1>
 					<button class="nav-link filter" data-filter=".odroid">Odroid</button>
 					<button class="nav-link filter" data-filter=".pine">PINE64</button>
 					<button class="nav-link filter" data-filter=".radxa">Radxa</button>
-					<button class="nav-link filter" data-filter=".allo">Allo</button>
 					<button class="nav-link filter" data-filter=".asus">ASUS</button>
 					<button class="nav-link filter" data-filter=".nanopi">NanoPi</button>
 					<button class="nav-link filter" data-filter=".orangepi">Orange Pi</button>