[META] Coding Style & Project Structure improvements

[moul]

Here, you can share your ideas in term of what can be improved on this version of sshportal

Keep in mind that there is a plan to make a full rewrite -> V2 #210, this issue can list ideas of improvements we can make right now and also the ones we could do when starting the V2

[moul]

• Add helpers/use library to validate email address and use it on various places of the project (as suggested here feat: Add the ability to create a user without an invite token #252 (comment))