Change donations to contrbutions, add tabbed nav

Introduces components for tabbed navigation and adds a tab menu and item
for non-financial contributions to the donations/contributions page.

app/components/main_with_tabnav_component.html.erb

@@ -0,0 +1,14 @@
+<main class="w-full max-w-6xl mx-auto pb-12 px-4 md:px-6 lg:px-8">
+  <div class="bg-white rounded-lg shadow">
+    <div class="px-6 sm:px-12 pt-2 sm:pt-4">
+      <div class="border-b border-gray-200">
+        <nav class="-mb-px flex" aria-label="Tabs">
+          <%= render partial: @tabnav_partial %>
+        </nav>
+      </div>
+    </div>
+    <div class="px-6 sm:px-12 py-8 sm:py-12">
+      <%= content %>
+    </div>
+  </div>
+</main>

app/components/main_with_tabnav_component.rb

@@ -0,0 +1,7 @@
+# frozen_string_literal: true
+
+class MainWithTabnavComponent < ViewComponent::Base
+  def initialize(tabnav_partial:)
+    @tabnav_partial = tabnav_partial
+  end
+end

app/components/tabnav_link_component.html.erb

@@ -0,0 +1,3 @@
+<%= link_to @path, class: @link_class do %>
+  <%= @name %>
+<% end %>

app/components/tabnav_link_component.rb

@@ -0,0 +1,21 @@
+# frozen_string_literal: true
+
+class TabnavLinkComponent < ViewComponent::Base
+  def initialize(name:, path:, active: false, disabled: false)
+    @name = name
+    @path = path
+    @active = active
+    @disabled = disabled
+    @link_class = class_names_link(path)
+  end
+
+  def class_names_link(path)
+    if @active
+      "border-indigo-500 text-indigo-600 w-1/2 py-4 px-1 text-center border-b-2"
+    elsif @disabled
+      "border-transparent text-gray-500 hover:text-gray-700 hover:border-gray-300 w-1/2 py-4 px-1 text-center border-b-2"
+    else
+      "border-transparent text-gray-500 hover:text-gray-700 hover:border-gray-300 w-1/2 py-4 px-1 text-center border-b-2"
+    end
+  end
+end