Docs: combine root index and getting started (#40)

Author: kraftbj

docs/getting-started/index.md

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+# Getting Started with Secure Custom Fields
+
+This section helps you get up and running with Secure Custom Fields (SCF). Whether you're new to WordPress development or an experienced developer, these guides will help you start using SCF effectively.
+
+## In This Section
+
+- [Installation](installation) - How to install and activate SCF
+- [Quick Start](quick-start) - Create your first custom field group in minutes
+
+## Documentation Sections
+
+- [Concepts](../concepts/) - Core concepts and architecture
+- [Features](../features/) - Detailed feature documentation
+- [Tutorials](../tutorials/) - Step-by-step guides
+- [Contributing](../contributing/) - How to contribute to SCF
+
+## Code Reference
+
+The [Code Reference](../code-reference/) provides detailed technical documentation of SCF's functions, classes, hooks, and APIs. This is particularly useful for developers who want to:
+
+- Extend SCF's functionality
+- Integrate SCF with other plugins or themes
+- Understand SCF's internal architecture
+- Find specific hooks and filters
+
+## Prerequisites
+
+- WordPress 6.0 or later
+- PHP 7.4 or later
+- Basic understanding of WordPress development