Add production deployment guide to readme

Author: J12934

README.md

@@ -5,13 +5,6 @@ This repository sources the [securecodebox.io] website. Our webpage is meant to
 ## Build and Run
 
 In order to build and run this website you need to install [Node.js and NPM] for your platform.  
-If installed run 
-
-```
-npm install -g gatsby-cli 
-```
-
-to install the required Gatsby CLI.  
 Finally you download/clone this repository and install all required Node modules:
 
 ```bash
@@ -23,16 +16,15 @@ Done! :) Now you can start developing and contributing.
 
 For development: 
 ```bash
-gatsby develop
+npm run develop
 ```
 For production locally:
 ```bash
-gatsby build
-gatsby serve
+npm run build
+npm run serve
 ```
 And then visit [this](http://localhost:8000/) in your browser.
 
-
 ## Style Guide
 
 The overall design-idea is a clean and professional look. And since securecodebox.io serves mostly an informational purpose, it should stay more simplistic than extraordinary, meaning include only information and elements which either are necessary or helpful and very few basic elements for a good look (e.g. fitting background picture). 
@@ -74,10 +66,14 @@ Icons should be license free and as close to the other icons' style as possible.
 -   [iconmonstr](https://iconmonstr.com/) 
 -   [pixabay](https://pixabay.com/)
 
+## Production Deployment
 
+All changes pushed to the `gh-source` branch get automatically build by GitHub Actions. 
+The artifacts of the build, aka. the build site, gets forced pushed to the master branch.
+The master branch then gets automatically deployed as a GitHub Page.
 
 [securecodebox.io]: https://securecodebox.github.io
 [secureCodeBox]: https://github.com/secureCodeBox/secureCodeBox
 [GatsbyJS]: https://www.gatsbyjs.org/
 [GitHub Pages]: https://pages.github.com/
-[Node.js and NPM]: https://nodejs.org/en/download/
+[Node.js and NPM]: https://nodejs.org/en/download/