Add more images to admin site customization

app/components/budgets/investment_component.html.erb

@@ -2,7 +2,7 @@
   <% if investment.image.present? %>
     <%= image_tag investment.image.variant(:large), alt: investment.image.title.unicode_normalize %>
   <% else %>
-    <%= image_tag "budget_investment_no_image.jpg", alt: investment.title %>
+    <%= image_tag(image_path_for("budget_investment_no_image.jpg"), alt: investment.title) %>
   <% end %>
 
   <% if investment.should_show_vote_count? || investment.should_show_price? %>

app/components/budgets/investment_component.rb

@@ -1,5 +1,5 @@
 class Budgets::InvestmentComponent < ApplicationComponent
-  delegate :locale_and_user_status, :namespaced_budget_investment_path, to: :helpers
+  delegate :locale_and_user_status, :namespaced_budget_investment_path, :image_path_for, to: :helpers
   attr_reader :investment
 
   def initialize(investment)

app/components/widget/feeds/process_component.html.erb

@@ -1,7 +1,7 @@
 <div class="legislation-process card">
   <%= link_to url_for(process) do %>
     <figure class="figure-card">
-      <%= image_tag("welcome_process.png", alt: "") %>
+      <%= image_tag(image_path_for("welcome_process.png"), alt: "") %>
       <figcaption>
         <span><%= t("welcome.feed.process_label") %></span><br>
         <h3><%= process.title %></h3>

app/components/widget/feeds/process_component.rb

@@ -1,4 +1,5 @@
 class Widget::Feeds::ProcessComponent < ApplicationComponent
+  delegate :image_path_for, to: :helpers
   attr_reader :process
 
   def initialize(process)