feat(shell): setup rmv for a user local install

When running rmv on other linux installes other than Ubuntu its better
to install rmv for the user. This then gets installed in `~/.rvm`.

This now sets up the path so we can use rmv no matter what distro we are
on.

site-modules/core/files/zshrc

@@ -102,9 +102,12 @@ if [ -d "${PHPENV_ROOT}" ]; then
     eval "$(phpenv init -)"
 fi
 
-# Ruby version manager (RVM)
+# Ruby version manager (RVM), this can be installed for the system or user
+# local.
 if [ -f "/etc/profile.d/rvm.sh" ]; then
     source "/etc/profile.d/rvm.sh"
+elif [ -s "$HOME/.rvm/scripts/rvm" ]; then
+    . "$HOME/.rvm/scripts/rvm"
 fi
 
 if [ -d "$HOME/.local/share/adr-tools/src" ]; then