Add containerizing subsection

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+.hugo_build.lock

content/Contributing/Containerizing/index.md

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+chapter = true
+pre = "<b><i class='fas fa-clone'></i> </b>"
+title = "Containerizing"
+weight = 100
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+
+# Containerizing
+
+## Abstract
+
+Nowadays it's common practice to have an environment up-and-running at your local machine which is capable of giving you a representation of the deployment environment.
+
+This allows us a better reviewing of our own code answering the question "How it would look like after the deployment?"
+
+## How to get started
+
+First of all we need to have the themes/relearn properly loaded. Most likely you have already cloned the repository. In this case use:
+
+`git submodule update --init --recursive`
+
+If you are wondering how to clone the submodules by default the `--recursive` will serve your needs.
+
+## Run the container
+
+By executing the following command, you will have your local alguidelines hugo server up-and-running:
+
+```docker run --rm -it -p 1313:1313 -v ${PWD}:/src klakegg/hugo:latest "server --buildDrafts --watch --bind 0.0.0.0"```
+
+## FAQ
+
+#### 1. I get the following Error when I try to run the container "Error building site: "/src/content/Contributing/ForkAndPR/index.md:14:1": failed to extract shortcode: template for shortcode "notice" not found"
+
+> Cloning the themes/relearn project solves this error: `git submodule update --init --recursive`.
+
+#### 2. I made some changes in the documentation but they are not shown to me in my local hugo environment.
+
+> Consider building the image and running your local docker container again.