[V2] Slugs

[CalvinWalzel]

This pull request introduces the friendly_id gem to replace numeric IDs with human-readable slugs for URLs. This involves changes across models, controllers, serializers, and database migrations. The most important changes include adding the friendly_id gem, updating models to use slugs, and modifying controllers and serializers to support the new slugs.

Integration of friendly_id gem:

• Added friendly_id gem to Gemfile.
• Created an initializer for friendly_id with global configuration. (config/initializers/friendly_id.rb)

Model updates:

• Updated City, Company, Continent, Country, and Region models to use friendly_id for generating slugs and ensuring slug presence validation. (app/models/city.rb, app/models/company.rb, app/models/continent.rb, app/models/country.rb, app/models/region.rb) [1] [2] [3] [4] [5]

Controller and serializer updates:

• Modified CompaniesController to use slugs instead of numeric IDs. (app/controllers/companies_controller.rb)
• Updated CompanySerializer and GeoFragmentSerializer to include slugs. (app/serializers/company_serializer.rb, app/serializers/geo_fragment_serializer.rb) [1] [2]

Frontend updates:

• Modified frontend components to use slugs in URLs instead of numeric IDs. (app/frontend/pages/companies/index.tsx, app/frontend/types/company.ts, app/frontend/types/geo_fragment.ts) [1] [2] [3]

Database migrations:

• Added database migrations to create slugs for existing records and ensure uniqueness and presence of slugs. (db/migrate/20240918173013_create_friendly_id_slugs.rb, db/migrate/20240918173030_add_slug_to_companies.rb, db/migrate/20240918180412_add_slug_to_continents.rb, db/migrate/20240918181314_add_slug_to_countries.rb, db/migrate/20240918181525_add_slug_to_region.rb, db/migrate/20240918181921_add_slug_to_city.rb) [1] [2] [3] [4] [5] [6]