Changed rails 6 to 7

Author: x1wins

Gemfile

@@ -1,2 +1,2 @@
 source 'https://rubygems.org'
-gem 'rails', '~>6'
+gem 'rails', '~>7'

README.md

@@ -45,12 +45,15 @@ production:
 
 ## Setup
 ```bash
-docker-compose run --no-deps web bundle exec rails webpacker:install
 docker-compose run --no-deps web bundle exec rake db:create
 docker-compose run --no-deps web bundle exec rake db:migrate
 docker-compose run --no-deps web bundle exec rake db:create RAILS_ENV=test
 docker-compose run --no-deps web bundle exec rake db:migrate RAILS_ENV=test
 ```
+or
+```bash
+docker-compose run --no-deps web bundle exec rake db:prepare
+```
 
 ## Start rails server
 ```bash