Add "Blog" page.

Also, update "Home" page.
Refactor CSS for better clarity.

Rename #content to .post and rename #content_wrapper to #content.
Separate the layout CSS from the styling CSS.
Change colour of the current page navigation link.
Add "Contact" page.
Remove the footer.
Add "Lorem Ipsum!" blog post.
Update "Welcome to Jekyll!" blog post.
Tweak the Sass CSS stylesheet.
Update "Blog" page.
Add icons.
Update navigation bar.

Update navigation bar to intelligently select the currently "active"
navigation link based on either the page URL or the page's categories.
Fix page ordering issue.
Update "Projects" and "Blog" pages.
Tweak the layout and style.
Update "About" page.
Update "Home" page and add "Accounts" page.
Add "Error 404" page.
Add sitemap.xml.
Add robots.txt.