Add host_var file for web05

Signed-off-by: Alan Orth <alan.orth@gmail.com>
roles/nginx: Ingenius use of YAML hashes to derive TLS key from another file

This is kinda crazy, but makes the host_vars much easier to read.

Signed-off-by: Alan Orth <alan.orth@gmail.com>
host_vars/web05: Remove TLS keys from host_vars

Now they live in one file, vars/tls_keys.yml.

Signed-off-by: Alan Orth <alan.orth@gmail.com>