add Bootstrap 3
add navigation bar
change font color and bg color
add logo-image
add logo image
more padding to nav
add padding and margin to #first-col
replace col-lg-6 with col-lg-12
Split col-lg-12 into col-md-7 and col-md-5
better padding for image and col-md-7
add computer image
add another row for more content
add dog images
add social col and Font Awesome for social icons
add css file for Font Awesome & Bootstrap social icons
add different bg color for social icon
finishing content row
add extra margin to content-row and headings
styling typography in content-row section
fixing floating and padding in row secondCallToAction