Certbot messed up

[gpmnsp]

There is no mention of installing certbot/snap.
I ran the install script and it has messed with my existing installation of certbot which was just fine before.
Now I have to sort out how to get rid of the snap version or how to make it work.

The script has also overwritten my existing nginx config without asking or making a backup.
Fortunately I held a backup by myself.

I think these are things worth mentioning in the Read.me.