(docs) Add core structure

Author: protocolstardust

docs/docs/content/CHANGELOG.md

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+# :material-newspaper: Changelog
+
+All notable changes to RayforceDB VS Code Extension will be documented in this file.
+
+!!! note ""
+    You can also subscribe for release notifications by joining our [:simple-zulip: Zulip](https://rayforcedb.zulipchat.com/#narrow/channel/549008-Discuss)!
+
+
+## **`0.4.0`**
+
+- Added full Rayfall language support with syntax highlighting and autocomplete
+- Improved REPL integration with environment variable inspection
+- Enhanced instance manager with folder organization for saved instances
+- Added custom file icons for `.rfl` and `.rf` files
+
+2025-01-XX | **[🔗 VS Code Marketplace](https://marketplace.visualstudio.com/items?itemName=RayforceDB.rayforce-vscode)** | **[🔗 GitHub](https://github.com/RayforceDB/rayforce-vscode/releases/tag/0.4.0)**
+

docs/docs/content/documentation/overview.md

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+# Appearance
+
+The RayforceDB VS Code Extension provides visual enhancements to make working with Rayfall code more enjoyable and efficient.
+
+## Custom File Icons
+
+Custom icons are provided for Rayfall source files to help you easily identify them in your project:
+
+- `.rfl` files - Rayfall source files
+- `.rf` files - Rayfall source files
+
+These icons appear in the VS Code file explorer, making it quick to spot Rayfall files in your project structure.
+
+IMAGE HERE
+
+## Syntax Highlighting
+
+Full syntax highlighting support for the Rayfall programming language, including:
+
+- **Keywords**: Special forms like `fn`, `let`, `if`, `do`, etc.
+- **Functions**: Built-in functions with proper highlighting
+- **Types**: Type names and type casts
+- **Strings**: String literals with escape sequence support
+- **Numbers**: Integers, floats, and special numeric literals
+- **Symbols**: Keyword symbols and quoted symbols
+- **Comments**: Line comments starting with `;`
+
+IMAGE HERE
+
+The syntax highlighting makes your Rayfall code more readable and helps catch syntax errors at a glance.
+

docs/docs/content/documentation/syntax/overview.md

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+# Instance Manager
+
+The Instance Manager provides a comprehensive view of all your RayforceDB instances, both local and remote.
+
+## Local Instances
+
+The extension automatically detects running local RayforceDB instances on your machine. You can see:
+
+- Process ID (PID)
+- Port number
+- Connection status
+- Process information (CPU and memory usage)
+
+IMAGE HERE
+
+## Saved Instances
+
+Save frequently used remote instances for quick access. Saved instances are persistent, so you don't need to set them up every time you open VS Code.
+
+IMAGE HERE
+
+## Folder Organization
+
+Organize your saved instances into handy folders and subfolders:
+
+- Create folders to group related instances
+- Create subfolders for even better organization
+- Drag and drop instances between folders
+- Rename or delete folders as needed
+
+IMAGE HERE
+
+## Connection Management
+
+- **Connect**: Click the connect button to establish a connection to an instance
+- **Disconnect**: Disconnect from the current instance when done
+- **Refresh**: Refresh the list to see newly started instances
+
+IMAGE HERE
+
+## Process Monitoring
+
+For local instances, view real-time process information including:
+
+- CPU usage
+- Memory consumption
+- Process details
+
+This helps you monitor resource usage and optimize your RayforceDB instances.
+
+IMAGE HERE
+

docs/docs/content/documentation/usage/instances.md

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+# Overview
+
+The RayforceDB VS Code Extension provides a complete development environment for RayforceDB, right inside VS Code.
+
+## Features
+
+### **Instance Manager**
+
+View and connect to running local and remote RayforceDB instances. Organize saved connections into folders and subfolders for easy management.
+
+### **Interactive REPL**
+
+Fully integrated REPL panel for executing Rayfall commands. Access environment variables, get autocomplete suggestions, and interact with your RayforceDB instances seamlessly.
+
+### **Environment Inspector**
+
+Introspect environment variables and see what's defined in your connected RayforceDB instance. Monitor process information and system resources.
+
+### **Rayfall Language Support**
+
+Full language support for the Rayfall programming language:
+
+- **Syntax Highlighting**: Beautiful syntax highlighting for `.rfl` and `.rf` files
+- **Autocomplete**: Intelligent autocomplete with built-in functions, keywords, and types
+- **File Icons**: Custom icons for Rayfall source files
+