feat(hedgedoc): add deployment_method=podman, add docs

roles/hedgedoc/README.md

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+# `finallycoffee.services.hedgedoc` ansible role
+
+Role to deploy and configure hedgedoc using `docker` or `podman`.
+To configure hedgedoc, set either the config as complex data
+directly in `hedgedoc_config` or use the flattened variables
+from the `hedgedoc_config_*` prefix (see
+[defaults/main/config.yml](defaults/main/config.yml)).
+
+To remove hedgedoc, set `hedgedoc_state: absent`. Note that this
+will delete all data directories aswell, removing any traces this
+role created on the target (except database contents).
+
+# Required configuration
+
+- `hedgedoc_config_domain` - Domain of the hedgedoc instance
+- `hedgedoc_config_session_secret` - session secret for hedgedoc
+
+## Deployment methods
+
+To set the desired deployment method, set `hedgedoc_deployment_method` to a
+supported deployment methods (see [vars/main.yml](vars/main.yml#5)).