Merge infra and k3 into one directory again

Since I don't have multiple terraform steps anymore it simply doesn't
make sense to me anymore to split all tasks into separate folders.
Instead I try to be as clear as possible in the README to make it easy
to follow the structure in the future without too much headache.

ansible.cfg

@@ -0,0 +1,6 @@
+[defaults]
+nocows = True
+inventory = inventory.ini,config.yml,vault.yml
+display_skipped_hosts = False
+error_on_undefined_vars = True
+vault_password_file = password.txt