Move pages under tldr, lint run.sh, update docs

tldr/rails-db

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# rails db
+
+> Various database-related subcommands for Ruby on Rails.
+> More information: <https://guides.rubyonrails.org/command_line.html>.
+
+- Create databases, load the schema, and initialize with seed data:
+
+`rails db:setup`
+
+- Access the database console:
+
+`rails db`
+
+- Create the databases defined in the current environment:
+
+`rails db:create`
+
+- Destroy the databases defined in the current environment:
+
+`rails db:drop`
+
+- Run pending migrations:
+
+`rails db:migrate`
+
+- View the status of each migration file:
+
+`rails db:migrate:status`
+
+- Rollback the last migration:
+
+`rails db:rollback`
+
+- Fill the current database with data defined in `db/seeds.rb`:
+
+`rails db:seed`