Add WIP docs on how to ansiblize recipes for premix

Signed-off-by: David Young <davidy@funkypenguin.co.nz>

docs/premix/ansiblizing/swarm.md

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+# Ansiblizing a recipe for Swarm
+
+!!! warning "This section is under construction :hammer:"
+    This section is a serious work-in-progress, and reflects the current development on the [sponsors](https://github.com/sponsors/funkypenguin)' "premix" repository
+    So... There may be errors and inaccuracies. Jump into [Discord](http://chat.funkypenguin.co.nz) in the #premium-support channel if you're encountering issues 😁
+
+## Update deploy.yml
+
+Edit `ansible/deploy.yml`, and find the swarm section, starting with:
+
+```yaml
+### non-critical swarm recipes start here, alphabeticized
+```
+
+Add an `import_role` task like this (*alphabeticized*) at the bottom:
+
+```yaml
+# Setup immich
+- { import_role: { name: docker-stack }, vars: { recipe: immich }, tags: [ immich ], when: combined_config.immich.enabled | bool }
+```
+
+## Update config
+
+Edit `ansible/group_vars/all/main.yml`, and edit the `recipe_default_config` dictionary, adding the necessary values, like this:
+
+```yaml
+immich:
+  enabled: false #(1)!
+  run_pre_deploy: | #(2)!
+    mkdir -p /var/data/immich/database-dump
+    mkdir -p /var/data/immich/upload
+    mkdir -p /var/data/runtime/immich/database 
+  run_post_deploy: | #(3)!
+    echo "this is just an example to show that it's possible to run tasks post-deploy!"
+```
+
+1. We disable all non-essential services by default - that way, the user can opt into them in their own config, which is later merged with this master config.
+2. Add as many pre-deploy commands as necessary - typically these will create the necessary data directories. `/var/data/config/<recipe>` will be created automatically.
+3. Likewise, add any necessary post-deployment commands
+
+## Ensure the recipe files are valid
+
+The playbook assumes that `/<recipe-name>/<recipe-name>.yml` and `/<recipe-name>/<recipe-name>.env-sample` exist. Without these (*and any other supporting files, ending in `-sample`*), unpleasant things will happen!
+