Docs: extended quickstart and install/run improvements

Author: yiseungmi87

docs/site/quickstart_extended.md

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+# Extended Quickstart Guide
+
+Welcome to the extended quickstart guide for Apache SystemDS. This quickstart page provides a high-level overview of both installation and points you to the detailed documentation for each path.
+
+SystemDS can be installed and used in two different ways:
+
+1. Using a **downloaded release**  
+2. Using a **source build**
+
+Each method is demonstrated in:
+- Local mode  
+- Spark mode  
+- Federated mode (simple example)
+
+For detailed configuration topics (BLAS, GPU, federated setup, contributing), see the links at the end.
+
+---
+
+# 1. Install from a Release
+
+If you simply want to *use* SystemDS without modifying the source code, the recommended approach is to install SystemDS from an official Apache release.
+
+**Full Release Installation Guide:** [SystemDS Install from release](https://apache.github.io/systemds/site/release_install.html)
+
+# 2. Install from Source
+
+If you plan to contribute to SystemDS or need to modify its internals, you can build SystemDS from source.
+
+**Full Source Build Guide:** [SystemDS Install from source](https://apache.github.io/systemds/site/source_install.html)
+
+# 3. After Installation
+
+Once either installation path is completed, you can start running scripts:
+
+- Local Mode - Run SystemDS locally
+- Spark Mode - Execute scripts on Spark through `spark-submit`
+- Federated Mode - Run operations on remote data using federated workers
+
+For detailed commands and examples: [Execute SystemDS](https://apache.github.io/systemds/site/run_extended.html)
+
+# 4. More Configuration
+
+SystemDS provides advanced configuration options for performance tuning and specialized execution environments. 
+
+- GPU Support — [GPU Guide](https://apache.github.io/systemds/site/gpu)  
+- BLAS / Native Acceleration — [Native Backend (BLAS) Guide](https://apache.github.io/systemds/site/native-backend)  
+- Federated Backend Deployment — [Federated Guide](https://apache.github.io/systemds/site/federated-monitoring.html)  
+- Contributing to SystemDS — [Contributing Guide](https://github.com/apache/systemds/blob/main/CONTRIBUTING.md)
+

docs/site/release_install.md

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+
+# Install SystemDS from a Release
+
+This guide explains how to install and set up SystemDS using the pre-built release archives. 
+
+---
+
+- [1. Download a Release](#1-download-a-release)
+- [2. Install on Windows](#2-install-on-windows)
+- [3. Install on Ubuntu 22.04](#3-install-on-ubuntu-2204)
+- [4. Install on macOS](#4-install-pon-macos)
+- [5. Verify the Installation](#5-verify-the-installation)
+
+---
+
+# 1. Download a Release
+
+Download the official release archive from the Apache SystemDS website:
+
+https://apache.org/dyn/closer.lua/systemds/
+
+After downloading the file `systemds-<VERSION>.tar.gz`, place the file in any directory you choose for installation.
+
+### Java Requirement ###
+For compatability with Spark execution and parser components, **Java 17** is strongly recommended for SystemDS.
+
+Verify Java 17:
+
+```bash
+java -version
+```
+
+If missing, install a JDK 17 distribution.
+
+---
+
+# 2. Install on Windows
+
+### 2.1 Extract the Release Archive
+
+Use Windows built-in extractor.
+
+### 2.2 Set Evironment Variables
+
+To run SystemDS from the command line, configure:
+- `SYSTEMDS_ROOT`-> the extracted folder
+- Add `%SYSTEMDS_ROOT%\bin` to your `PATH`
+
+Example (PowerShell):
+
+```bash
+setx SYSTEMDS_ROOT "C:\path\to\systemds-<VERSION>"
+setx PATH "$env:SYSTEMDS_ROOT\bin;$env:PATH"
+```
+
+Restart the terminal afterward.
+
+# 3. Install on Ubuntu 22.04
+
+### 3.1 Extract the Release
+
+```bash
+cd /path/to/install
+tar -xvf systemds-<VERSION>.tar.gz
+cd systemds-<VERSION>
+```
+
+### 3.2 Add SystemDS to PATH
+
+```bash
+export SYSTEMDS_ROOT=$(pwd)
+export PATH="$SYSTEMDS_ROOT/bin:$PATH"
+```
+
+# 4. Install on macOS
+
+### 4.1 Extract the Release
+
+```bash
+cd /path/to/install
+tar -xvf systemds-<VERSION>.tar.gz
+cd systemds-<VERSION>
+```
+### 4.2 Add SystemDS to PATH
+
+```bash
+export SYSTEMDS_ROOT=$(pwd)
+export PATH="$SYSTEMDS_ROOT/bin:$PATH"
+```
+
+# Verify the Installation
+
+### 5.1 Check the CLI
+
+```bash
+systemds -help
+```
+
+You should see usage information printed to the console.
+
+### 5.2 Create a Simple Script
+
+```bash
+echo 'print("Hello World!")' > hello.dml
+```
+
+### 5.3 Run the Script
+
+```bash
+systemds -f hello.dml
+```
+
+Expected output:
+
+```bash
+Hello World!
+```
+
+# Next Steps
+
+For running scripts in Spark mode or experimenting with federated workers, see the Execution Guide: [Execute SystemDS](run_extended.md)
+