use pixi for declaring dev dependencies and running the site

Author: d-v-b

README.md

@@ -4,7 +4,29 @@ Main Zarr website hosted at https://zarr.dev
 
 ## Building
 
-To build the webpage, you will need a working Ruby installation.
+### Option 1: Using Pixi (Recommended)
+
+The easiest way to build and serve the site is using [Pixi](https://pixi.sh), which manages all dependencies automatically.
+
+1. Install Pixi:
+```bash
+curl -fsSL https://pixi.sh/install.sh | bash
+```
+
+2. Start the development server:
+```bash
+pixi run dev
+```
+
+The site will be available at http://localhost:4000 with live reload enabled. Pixi will automatically install all dependencies on first run.
+
+Additional commands:
+- `pixi run build` - Build the site for production
+- `pixi run install` - Install/update Ruby gems (if needed manually)
+
+### Option 2: Manual Ruby Installation
+
+To build the webpage manually, you will need a working Ruby installation.
 
 If you are on Ubuntu and want to install the requirements locally,
 follow the steps below as root. Alternatively, see the Dockerfile

_config.yml

@@ -52,14 +52,15 @@ plugins:
 # Exclude from processing.
 # The following items will not be processed, by default. Create a custom list
 # to override the default setting.
-# exclude:
-#   - Gemfile
-#   - Gemfile.lock
-#   - node_modules
-#   - vendor/bundle/
-#   - vendor/cache/
-#   - vendor/gems/
-#   - vendor/ruby/
+exclude:
+  - .pixi/
+  - Gemfile
+  - Gemfile.lock
+  - node_modules
+  - vendor/bundle/
+  - vendor/cache/
+  - vendor/gems/
+  - vendor/ruby/
 
 # https://github.com/mmistakes/minimal-mistakes/blob/641ca6f3d8cd8fb0ae24e4f77b2e62a44a65e53b/_config.yml
 logo: android-chrome-512x512.png