lk | update ruby version and add link to bikes fixed per week report

Gemfile

@@ -1,4 +1,5 @@
 source 'https://rubygems.org'
+ruby "2.3.1"
 
 gem 'rails', '4.2'
 gem 'pg', '0.15.1'

app/views/static_pages/home.html.haml

@@ -23,3 +23,5 @@
   %h2 Reports
   %br
   = link_to "Bikes Sold Per Year", bikes_sold_per_year_path
+  %br
+  = link_to "Bikes Fixed Per Week", bikes_fixed_per_week_path