add structure in the site layout
add signup code in home page
add signup link
add image_help tag
add the bootstrap-sass gem to the Gemfile
add a line for asset pipeline compatibility
add custom CSS
add Bootstrap CSS
add CSS for some universal styling
add CSS for nice typography
add CSS for the site logo
add shim partial
add shim partial
create new file _header.html.erb
add a partial for the site header
create a new file _footer.html.erb
add a partial for the site footer
add footer partial in a site layout
add the CSS for the site footer
change style