Add installation via docker compose (MVP 1)

- Add markdown tabs blocks
- Fix [Issue 604](https://github.com/chatmail/relay/issues/604)
- Add `--skip-dns-check` argument to `cmdeploy run` command
- Add `--force` argument to `cmdeploy init` command
- Add startup for `fcgiwrap.service`
- Add extended check when installing `unbound.service`
- Add configuration parameters (`is_development_instance`, `use_foreign_cert_manager`, `acme_email`, `change_kernel_settings`, `fs_inotify_max_user_instances_and_watchers`)

cmdeploy/pyproject.toml

@@ -20,6 +20,7 @@ dependencies = [
   "pytest-xdist", 
   "execnet",
   "imap_tools",
+  "pymdown-extensions",
 ]
 
 [project.scripts]