Changing styling for different post type summaries

Moved post header from index.html to summary.html to allow for different post headers depending on
the post type
Link format now links to the described link, not the post url, and includes the full post
Image format includes a 500px version of the image, no header meta & full post content

Added link to author page in post meta
Added my own category links template
Fixed layout issues, and minor style changes

Changed #content max width to 60em and centralised on the page
Set footer to clear:both
Changed RSS icon to an orange colour
Reduced icons in footer and tidied it up
Fixed layout issues, and minor style changes

Changed #content max width to 60em and centralised on the page
Set footer to clear:both
Changed RSS icon to an orange colour
Reduced icons in footer and tidied it up