Add tag search/overview

[jwillmer]

If I click on a tag I like to be redirected to a collection with all related posts. Url should be something like:

blog/tag/azure/

[jwillmer]

Seams like the only solution without a plugin is to manually create tag pages: http://christianspecht.de/2014/10/25/separate-pages-per-tag-category-with-jekyll-without-plugins/

This solution does not generate tag pages but one tag page that can jump to a tag position by url /tag/#azure: https://codinfox.github.io/dev/2015/03/06/use-tags-and-categories-in-your-jekyll-based-github-pages/