Remove custom rule for erb file.
Add layout with sidebar for default pages.
Add layout without sidebar for custom pages.
Add rule to separate items with sidebars and items without.
Use new layout for default, which receives content with or without sidebar.
Fix no-sidebar layout to use up all available space.
Fix rules to use identifier with trailing slash when matching about page.
Move about page to Markdown rather than pure html.
Contact page: do not use bootstrap columns, as they unnecessarily indent the text.
Fix regexp rules to work properly with the intended items.
Justify text in the posts.