Add support for Jekyll Archives plugin
- Option to select GitHub Pages compatible tag/category page archive or plugin generated archives

Edit sidebar and page meta styles

Properly detect if a page has tags or categories
- Arrays are truthy, test on first item instead

Add page taxonomy links for tags and categories
- Customizable text via _data file
- Enable/disable links by setting archive page filenames in _config.yml

Add file extensions back to non-helper _includes