Translation: Yes, you can delete it, leaving only the manager folder or the manager.zip file.
Escalating this topic so this can be resolved by a root admin.
Donation verified. What email address can we send the invite to? it needs to be a different email than what you registered your Johnny with. (You can DM me the email address if you like.)
if the site works with the code above i don't see any reason of changing it other than personal preference.
it can either be http or https depending on if your site has a valid ssl certificate or not. if so then it should be https.