Frontend updates and changes

- Remove items/runes separate pages, put everything into a "build" page.
- Show summoner spells.
- Add a build variant selector, that for now only selects runes

frontend/types/cdragon.ts

@@ -21,6 +21,13 @@ declare global {
   }
   type Item = {
     id: number
+    iconPath: string
+    name?: string
+  }
+  type SummonerSpell = {
+    id: number
+    iconPath: string
+    name: string
   }
   type PerksResponse = {
     data: Ref<Array<Perk>>