Account namespace updates: part 4 (transfers, singular namespacing) (#896)

* Move Transfer to Account namespace

* Fix partial resolution due to namespacing plurality

* Make category and tag controllers consistent with namespacing convention

* Update stale partial reference

app/controllers/account/logos_controller.rb

@@ -0,0 +1,10 @@
+class Account::LogosController < ApplicationController
+  def show
+    @account = Current.family.accounts.find(params[:account_id])
+    render_placeholder
+  end
+
+  def render_placeholder
+    render formats: :svg
+  end
+end