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/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