Iteration I4: Adding a Sidebar, More Administration

Let’s start with adding links to various administration functions to the sidebar in the layout and have them show up only if a :user_id is in the session:

rails50/depot_r/app/views/layouts/application.html.erb
​ ​<!DOCTYPE html>​
​ <html>
​  <head>
​  <title>Pragprog Books Online Store</title>
​  ​<%=​ csrf_meta_tags ​%>​
​ 
​  ​<%=​ csrf_meta_tags ​%>​
​ 
​  ​<%=​ stylesheet_link_tag ​'application'​, ​media: ​​'all'​,
​  ​'data-turbolinks-track'​: ​'reload'​ ​%>​
​  ​<%=​ javascript_include_tag ​'application'​, ​'data-turbolinks-track'​: ​'reload'​ ​%>​
​  </head>
​ 
​  <body class=​"​​<%=​ controller.controller_name ​%>​​"​>
​  <div id=​"banner"​>
​  ​<%=​ image_tag ​'logo.svg'​, ​alt: ​​'The Pragmatic Bookshelf' ...

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