lk | adds links to previous and next bikes on bike edit page and removes

bike#show route

app/views/bikes/edit.html.haml

@@ -5,6 +5,12 @@
     .col-sm-3.col-sm-offset-3
       =button_to "Mark as sold", {action: "mark_as_sold", id: @bike.id}, method: :patch, class: "btn btn-default"
   = render 'edit_form'
-  = link_to 'Show', @bike
+  - if @next_bike
+    = link_to 'Next Bike', edit_bike_path(@next_bike)
+  - else
+    = link_to 'New Bike', new_bike_path
   |
-  = link_to 'Back', bikes_path
+  = link_to 'All Bikes', bikes_path
+  - if @previous_bike
+    |
+    = link_to 'Previous Bike', edit_bike_path(@previous_bike)

app/views/bikes/new.html.haml

@@ -1,4 +1,6 @@
 .container
   %h1 New bike
   = render 'new_form'
-  = link_to 'Back', bikes_path
+  = link_to 'All Bikes', bikes_path
+  |
+  = link_to 'Previous Bike', edit_bike_path(@previous_bike)