1. Included jekyll-archive gem, which enabled seeing posts by category, tag, year, day and month.
Minor Changes:
1. Created tag.html and category.html which lists all the tags and categories respectively present in the site linking to their respective pages.
2. Disqus code in comments.html
3. Reading time code in reading_time.html
4. Code to get all the tags for post in post_tags.html
5. All the layouts needed for jekyll-archive gem in archives directory