Finish styling blog title and description

Finishes the section titled "blog title and description".
Alter margin and paddings for header and articles

Finishes section "Header and Articles".
Update gitignore with right ds_store variable
Add subtle pattern images to theme
Add border around the blog title and article

Finishes "borders and wrapper spacing" section.
Add a cool css ribbon style on post title
Style date to make it appear cut out