Multiple changes

- backend: add summoner spells
- backend: add build variants
- backend: builds are now storing full tree with runes (keystones)
- backend: build trees are split on starter items and merged on runes
- frontend: computing core tree now
- frontend: variant selectors

frontend/components/nav/SideBar.vue

@@ -137,7 +137,7 @@ if (route.path.startsWith('/tierlist/')) {
         <h3 style="font-size: 18px; font-weight: 200; opacity: 0.5">Loading stats...</h3>
       </template>
       <NuxtLink to="/about"><h3>About</h3></NuxtLink>
-      <h2 style="font-size: 10px; font-weight: 200; margin-top: 3px">
+      <h2 style="font-size: 10px; font-weight: 200; margin-top: 3px; margin-right: 10px">
         BuildPath isn't endorsed by Riot Games and doesn't reflect the views or opinions of Riot
         Games or anyone officially involved in producing or managing Riot Games properties. Riot
         Games, and all associated properties are trademarks or registered trademarks of Riot Games,