As a user, I want to see relevant blog posts on the front page

[li-kai]

Currently if you go to the front page, you'll see blogposts about Friday hacks overwhelming content.

We want to filter them out. This involves:

• Inserting a "friday-hacks" category to all posts (This should be easily automated)
• Writing a function to only pick non-friday hack blog posts to display in the front page.