Add Docker setup, display top ranked HN stories, and add recommendation features.

[bryanbrunetti]

• Introduced a .env file and sample for environment configuration.
• Updated .gitignore to exclude JetBrains IDE configs and Postgres Docker data.
• Created Dockerfile for setting up Ruby, Node.js, and Yarn in a Docker environment.
• Added vcr and webmock gems to Gemfile for testing, and updated Gemfile.lock accordingly.
• Implemented a PagesController action to redirect signed-in users to the stories view.
• Created RecommendationsController and StoriesController to handle recommendations and story views.
• Added Recommendation, Story, and StoryRanking models with corresponding migrations for tracking user story preferences.
• Added job HackernewsJob to fetch top stories from Hacker News and update rankings.
• Enhanced application.html.erb layout with navigation links for authenticated users.
• Updated pages/home.html.erb to include login and sign-up links.
• Added views for displaying top stories and recommendations.
• Introduced Docker entrypoint script for initializing the database and starting the server.
• Modified database.yml and environment files to support Docker-based development.
• Updated routes.rb to define routes for viewing stories, recommendations, and managing user recommendations.