Development scripts proposition

[Mik-TF]

Propositions

Here are some propositions from when I run the scripts.

• adding -p for mkdir: useful if you run the script and the downloaded stopped in the middle, you simply rerun the script (otherwise, have to delete the directories)
• replaced systemctl status node-exporter with systemctl is-actiave node-exporter: to avoid having to break the script (with ctrl-c) when doing the install script.
• added a break in a case so we don't have an infinite loop
• updated the displayed text