Add extra nav for settings & clean header buttons

app/views/contests/settings_public_edit.html.slim

@@ -0,0 +1,17 @@
+= render "params_nav"
+
+= form_with model: @contest, url: "/contests/#{@contest.id}/settings/public" do |form|
+  .row.mt-2
+    .col
+      .form-check.form-switch
+        = form.check_box :public, class: "form-check-input"
+        = form.label :public
+  .row.mt-3
+    .col
+      .form-floating
+        = form.select :ranking_mode, Ranking::AVAILABLE_RANKING_MODES.map { |mode| [ mode[:name], mode[:id] ] }, {}, class: "form-select"
+        = form.label :ranking_mode
+
+  .row.mt-4
+    .col
+      = form.submit t("helpers.buttons.update"), class: "btn btn-primary"