Update README with Nuke-based build instructions

Replace outdated PSake/manual PDF printing instructions with:
- Single command to generate PDFs via build.ps1 / build.sh
- Launch website locally via launch-website.ps1
- Prerequisites: .NET 10 SDK + Chrome (Ruby auto-installed)

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: dennisdoomen

README.md

@@ -5,26 +5,36 @@ See the landing page at https://www.csharpcodingguidelines.com
 
 ## How to create the PDFs
 
-1. From the root of the repo, run the `build.bat` script to build the HTML versions of the guidelines and cheat sheet.
-2. From the `Artifacts` folder, open the `CSharpCodingGuidelines.htm` into your favorite browser and print as PDF. Use the default margins, no headers and footers, and set the scaling to 80% for A4 sheets.
-3. Do the same for the `CSharpCodingGuidelinesCheatsheet.htm`, but use  landscape orientation and minimum margins. A scaling of 84% should allow you to print the cheat sheet as a double-sided A4 sheet. Just make sure you disable headers and footers, and  enable printing background graphics to keep the colored boxes with auxiliary information.
+From the root of the repo, run:
 
-## How to build this site
+```
+.\build.ps1        # Windows
+./build.sh         # macOS / Linux
+```
 
-### Prerequisites
+This compiles all guideline rules into two PDF files in the `Artifacts` folder:
+
+- `CSharpCodingGuidelines.pdf` — the full guidelines document
+- `CSharpCodingGuidelinesCheatsheet.pdf` — the two-page cheat sheet
+
+Pandoc is downloaded automatically on first run. [Google Chrome](https://www.google.com/chrome/) must be installed for PDF rendering.
+
+## How to preview the site locally
 
-* Ruby 3.1. 
-    * An easy way to install is to use `choco install ruby`.
-    * Or use the **Ruby+Devkit installer** from [RubyInstaller for Windows](https://rubyinstaller.org/downloads/archives/).
-    * Note that you may have to reopen your command shell to get the `ruby --version` command to work,
-* The `bundler` 
-    * Run `gem install bundler` to install it. If you receive SSL-related errors while running gem install, try running `refreshenv` first.
+Run the following script from the root of the repo:
 
-### Building
+```
+.\launch-website.ps1        # Windows
+./build.sh LaunchWebsite    # macOS / Linux
+```
+
+This installs Ruby 3.3 (if not already present), runs `bundle install`, and starts the Jekyll development server at `http://localhost:4000`. The server monitors for changes when using the `--incremental` flag.
+
+### Prerequisites
 
-* Clone this repository
-* Run `bundle install`
-* Run `bundle exec jekyll serve`. To have it monitor your working directory for changes, add the `--incremental` option.
+* [.NET 10 SDK](https://dotnet.microsoft.com/download)
+* [Google Chrome](https://www.google.com/chrome/) (for PDF generation)
+* Ruby 3.3 is installed automatically when launching the website locally
 
 ### Troubleshooting