feat: migrate away from transitional packages

Several of the packages being installed were actually transitional packages, that is, the package itself is either a complete no-op (since the package is already installed), or else the package only exists to depend on another package of a new name (to support people who are running older operating systems).

For the former, we can drop the dependency entirely, and for the latter we should use the new package name directly.

bootstrap.sh

@@ -168,10 +168,6 @@ install-dokku-from-deb-package() {
     NO_INSTALL_RECOMMENDS=" --no-install-recommends "
   fi
 
-  echo "--> Initial apt-get update"
-  apt-get update -qq >/dev/null
-  apt-get -qq -y --no-install-recommends install apt-transport-https
-
   if ! command -v docker &>/dev/null; then
     echo "--> Installing docker"
     if uname -r | grep -q linode; then