* Fixed HTML errors in /app/views/additional_content_boxes
* Fixed indentation
* Fixed linting error in /app/views/comments
* Fixed indentation in /app/views/html_variants
* Fixed HTML errors + Fixed indentation in /app/views/internal
* Fixed HTML errors + Fixed indentation in /app/views/layouts
* Fixed indentation in /app/views/mailers
* Fixed indentation in /app/views/moderations
* Fixed HTML errors + Fixed indentation in /app/views/notifications
* Fixed HTML errors in /app/views/pages
* Fixed HTML errors + Fixed indentation in /app/views/social_previews
* Fixed indentation in /app/views/stories
* Fixed indentation in /app/views/stripe_subscriptions
* Fixed indentation in /app/views/tags
* Fixed indentation in /app/views/users
* Test milestone notifications
* Add initial milestone notifications
* Add extra milestone goalposts
* Move send reaction milestone
* Use proper twilio-video package version
* Add random giphys gifs to milestones
* Make images responsive and add addl gifs
* Add guard statement for older articles
* Update app/views/notifications/_milestone.html.erb
Link to Giphy page instead of source page
* Generate gifs via class and factor in aspect ratio
* Add border radius to gifs
Co-Authored-By: Zhao-Andy <andyzhao.zhao@gmail.com>