New UI design, hearts, and bug fixes

New Features

• Revamped design to be more colorful with stack images for every guide, etc.
• Added ability to heart guides
  • Requires use of redis and use of ENABLE_HEARTING and REDIS_HEARTS_DB_URL environment variables
• Support for Github Bio on profile and article pages
• Improved support for Facebook Open Graph tags on homepage and article
• Improved layout of review page and home page when there is no featured guide
• New stack images
  • Thanks @eh3rrera!
• Use Github webhooks to keep list of branches and cache up to date
  • Requires use of WEBHOOK_SECRET environment variable
• New page highlighting tutorial contest
• Properly escape all code on article pages, not just HTML

Bug Fixes

• Fix exception when running with empty REDISCLOUD_URL env variable
• Fix html escaping issues on article page
• Shorten long author names to prevent from breaking out of design boxes
• KeyError exception on some invalid page URLs
• Ignore invalid statuses when reading article
• Error when handling failed github authentication request
• Bug with removing a branch when it being added again
• Problem unpredictable featured guide when two guides have the same title

Changes

• Add CTA to article list when filtering returns no results
• Guides are now grouped by publish status on profile page
• All markdown is rendered on front-end with Javascript instead of using Github API
• Changed copy on login page to be more informative
• New logo highlighting our sponsor, Pluralsight
• Store featured guide with redis
• Remove case-insensitive comparison for featured guide environment variable