feat: Flat import of markdown repo

This is a flat (without history) import of (some of) the content
from our markdown module.

We've imported this without history because the repo contains our
blog posts and showcases posts content prior to porting them to strapi.

Since this contains many images, it would balloon the size of this repo
to import the full history.

Instead, please refer to the history of the (archived) markdown repo
at: https://github.com/freesewing/markdown

markdown/dev/tutorials/getting-started-linux/installing-nvm/en.md

@@ -0,0 +1,42 @@
+---
+title: Installing nvm
+order: 10
+---
+
+FreeSewing is built with [Node.js](https://nodejs.org/), a JavaScript runtime.
+
+You'll need to install Node JS on your system, and to do so, we'll 
+use [nvm](https://github.com/nvm-sh/nvm), short for _Node version manager_.
+
+Using nvm has a number of benefits in comparison with installing Node from
+the node.js website, or from a package provided by your linux distribution:
+
+ - You can easily switch between different Node versions
+ - Everything gets installed in your home folder, avoiding permission problems
+
+To setup nvm, run the following command in a terminal:
+
+```bash
+curl -o- https://raw.githubusercontent.com/nvm-sh/nvm/v0.36.0/install.sh | bash
+```
+
+If you don't have `curl` on your system, here's an alternative approach using `wget`:
+
+```bash
+wget -qO- https://raw.githubusercontent.com/nvm-sh/nvm/v0.36.0/install.sh | bash
+```
+
+After the script is completed, try running the following command:
+
+```bash
+nvm
+```
+
+If all goes well, it should show you the nvm help. 
+
+<Tip>
+
+If you get `nvm: command not found` or something similar, close the current terminal
+window, and open a new one. Now `nvm` should be found.
+
+</Tip>