upgrades: temporarily disable Gold account upgrades.

Disable upgrades while we migrate away from Stripe.

app/views/static/privacy_policy.html.erb

@@ -60,9 +60,7 @@
         purchase with us. This information includes your credit card number,
         security code, and expiration date, your email address, your location
         (such as your country, your postal code, your billing address, and your
-        location at time of purchase), and your IP address. All payment
-        information is securely stored by Stripe. You may find their privacy
-        policy at <%= external_link_to "https://stripe.com/privacy" %>.
+        location at time of purchase), and your IP address.
       </li>
 
       <li>

app/views/user_upgrades/new.html.erb

@@ -1,6 +1,5 @@
 <% page_title "Account Upgrade" %>
 <% meta_description "Upgrade to a Gold account." %>
-<script src="https://js.stripe.com/v3/"></script>
 
 <%= render "users/secondary_links" %>
 
@@ -98,10 +97,10 @@
           <td></td>
           <% if @user_upgrade.purchaser.is_anonymous? %>
             <td><%= link_to "Login", login_path(url: new_user_upgrade_path), class: "login-button button-primary" %></td>
-            <td><%= link_to "Get #{Danbooru.config.canonical_app_name} Gold", login_path(url: new_user_upgrade_path), class: "login-button button-primary" %></td>
+            <td><%= button_to "Get #{Danbooru.config.canonical_app_name} Gold", nil, class: "button-primary", disabled: true %></td>
           <% elsif @recipient.level == User::Levels::MEMBER %>
             <td></td>
-            <td><%= button_to "Get #{Danbooru.config.canonical_app_name} Gold", user_upgrades_path(user_id: @recipient.id, upgrade_type: "gold", country: params[:country], promo: params[:promo]), class: "button-primary", remote: true, disable_with: "Redirecting..." %></td>
+            <td><%= button_to "Get #{Danbooru.config.canonical_app_name} Gold", nil, class: "button-primary", disabled: true %></td>
           <% else %>
             <td></td>
             <td><%= button_to "Get #{Danbooru.config.canonical_app_name} Gold", nil, class: "button-primary", disabled: true %></td>