Let user remove nostr pubkey from account

spec/features/settings/experiments_spec.rb

@@ -19,4 +19,22 @@ RSpec.describe 'Experimental Settings', type: :feature do
     #   worth it for now
     # end
   end
+
+  context "With pubkey configured" do
+    before do
+      user.update! nostr_pubkey: "07e188a1ff87ce171d517b8ed2bb7a31b1d3453a0db3b15379ec07b724d232f3"
+    end
+
+    scenario 'Remove nostr pubkey from account' do
+      visit settings_experiments_path
+      expect(page).to have_field("nostr_public_key",
+        with: "07e188a1ff87ce171d517b8ed2bb7a31b1d3453a0db3b15379ec07b724d232f3",
+        disabled: true)
+
+      click_link "Remove"
+      expect(page).to_not have_field("nostr_public_key")
+      expect(page).to have_content("verify your public key")
+      expect(user.reload.nostr_pubkey).to be_nil
+    end
+  end
 end