add styling to blog/_tags.html base page
created post_tags.html include view, added to index.html and post.html
truncate post content on index, add 'read more' link
reorganize post tag include templates
change icon-long-arrow-right to icon-double-angle-right for read more icon
add link for navbar brand
adding fab function to generate secret key
adding content to About page
adding TagManager, plus method to return tags in alphabetical order
is_visible should return a hyperlink
I didn't need to do that to order the Tag objects... silly