Image Post, img improvements, Colourblind friendly coloured links.

> __Note__ I cleaned up the gitignore, it will now ignore posts and drafts in the posts and drafts folders, be aware of this when you merge!

I have added colourblind friendly links, a new img class, .image-half-left and .image-half-right for half width images with appropriate float, margin, etc...

I have added a new post type layout called image-post which allows you to put a `image: url` in the front-matter to create image centric posts.

I have optimized and compressed the .css file for you! Also added a credit for myself in the .css file.