Move app layout to slim

app/views/layouts/application.html.slim

@@ -0,0 +1,21 @@
+doctype html
+html
+  head
+    title Puzzle Scoreboard
+    meta name="viewport" content="width=device-width,initial-scale=1"
+    meta name="apple-mobile-web-app-capable" content=yes
+    meta name="mobile-web-app-capable" content=yes
+    = csrf_meta_tags
+    = csp_meta_tag 
+
+    = yield :head
+
+    link rel="icon" href="/icon.png" type="image/png"
+    link rel="icon" href="/icon.svg" type="image/svg+xml"
+    link rel="apple-touch-icon" href="/icon.png"
+
+    = stylesheet_link_tag :app, "data-turbo-track": "reload"
+    = javascript_importmap_tags
+
+  body
+    = yield