Add User#timeline_posts
Update '.gitignore'
Change 'config/deploy/production.rb'
Remove appsignal stuff
Don't use S3 datastore
Deploy from fork repo
Set correct Ruby version
Don't use chruby
Use 'capistrano/rbenv'
Fix dotenv config

We don't use 'dotenv-deployment' for production because it doesn't work
for our setup.
Remove default tagline
Remove turbolinks crap