v8.0.0

* Updated base theme to Keel.
* Updated to Kraken 5.
* Switched to left-aligned layout.
* Changed default font to PT Serif.
* Switched to navbar style navigation on bigger screens.
* Converted icons to SVG.
* Updated feature detection scripts for better extensibility.
* Conditionally load main.js using loadJS after passing mustard test.
* Conditionally load Google web fonts using loadCSS only if @font-face supported.
* Added width-adjustment and animation to search field on larger screens.
* Updated screenshot to HDPI.