Added SEO capabilities

@jasonlemay Just look at the config.xml files. 
Each lower level overrides the upper level, except for title. Lower levels titles are prepended (ie "Mixins - GSSS - Arcbees Developers Site") would be generated when writing
`title="Mixins"` in the mixins folder config.xml, `title="GSSS"`in the GSSS level config.xml, and `title="Arcbees Developers Site"` at the root config.xml

The `style` parameter is the CSS class set to the `#holder` div
It's not really a logo, it's more like a preview or screenshot, the associated image when you share a link. But it's okay to still name it `logo`