Structure the development documentation

doc/development/README.md

 # Development
 
+## Outside of docs
+
+- [CONTRIBUTING.md](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CONTRIBUTING.md) main contributing guide
+- [PROCESS.md](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/PROCESS.md) contributing process
+- [GitLab Development Kit (GDK)](https://gitlab.com/gitlab-org/gitlab-development-kit) to install a development version
+
+## Styleguides
+
+- [Documentation styleguide](development/doc_styleguide.md) Use this styleguide if you are
+  contributing to documentation.
+- [Migration Style Guide](migration_style_guide.md) for creating safe migrations
+- [Testing standards and style guidelines](testing.md)
+- [UI guide](ui_guide.md) for building GitLab with existing css styles and elements
+- [SQL guidelines](sql.md) for SQL guidelines
+
+
+## Process
+
+- [Code review guidelines](code_review.md) for reviewing code and having code reviewed.
+
+## Backend howtos
+
 - [Architecture](architecture.md) of GitLab
 - [CI setup](ci_setup.md) for testing GitLab
-- [Code review guidelines](code_review.md) for reviewing code and having code
-  reviewed.
 - [Gotchas](gotchas.md) to avoid
 - [How to dump production data to staging](db_dump.md)
 - [Instrumentation](instrumentation.md)
-- [Licensing](licensing.md) for ensuring license compliance
-- [Migration Style Guide](migration_style_guide.md) for creating safe migrations
 - [Performance guidelines](performance.md)
 - [Rake tasks](rake_tasks.md) for development
 - [Shell commands](shell_commands.md) in the GitLab codebase
 - [Sidekiq debugging](sidekiq_debugging.md)
-- [SQL guidelines](sql.md) for SQL guidelines
-- [Testing standards and style guidelines](testing.md)
-- [UI guide](ui_guide.md) for building GitLab with existing css styles and elements
+
+## Compliance
+
+- [Licensing](licensing.md) for ensuring license compliance