Add doctype html as doctype 5 is deprecated.
Add more readability to _layout
Add link to author's page in layout.
Add link to author's page in shared/author.
Add tag styles.
Add tags directory and sample tags.
Capitalize hello title.
Add support for tags in authors/_author.jade
Add a new tags {Array of String}, item to each post in _data.json.
Add tag support to main layout.