move roles, files and templates dirs out of playbook dir into root dir

Because of how Ansible local relative search paths work, the global
"files" and "templates" directories need to be next to the playbooks.
However its not intuitive to look into the "playbooks" directory to find
the files and templates for a host.
Therefore move them out of the "playbooks" directory into the root
directory and add symlinks so everything still works.

Similarly for local roles, they also need to be next to the playbooks.
So for a nicer structure, move the "roles" directory out into the root
directory as well and add a symlink so everything still works.

Also see:
https://docs.ansible.com/ansible/latest/playbook_guide/playbook_pathing.html#resolving-local-relative-paths
https://docs.ansible.com/ansible/latest/playbook_guide/playbooks_reuse_roles.html#storing-and-finding-roles

roles/ola/handlers/main.yaml

@@ -0,0 +1,6 @@
+- name: Restart olad
+  become: true
+  ansible.builtin.systemd:
+    service: olad.service
+    state: restarted
+    daemon-reload: true

roles/ola/meta/argument_specs.yaml

@@ -0,0 +1,22 @@
+---
+argument_specs:
+  main:
+    options:
+      ola__configs:
+        description: A list of ola configurations.
+        type: list
+        elements: dict
+        required: true
+        options:
+          name:
+            description: >-
+              The name of the configuration file, where the configuration should
+              be deployed to. The file will be placed under `/etc/ola/` and
+              `.conf` will be appended to the given name. So in the end the path
+              will be like this: `/etc/ola/\{\ name \}\}.conf`.
+            type: str
+            required: true
+          content:
+            description: The content of the configuration.
+            type: str
+            required: true

roles/ola/meta/main.yaml

@@ -0,0 +1,8 @@
+---
+dependencies:
+  - role: distribution_check
+    vars:
+      distribution_check__distribution_support_spec:
+        - name: Debian
+          major_versions:
+            - "11"

roles/ola/tasks/main.yaml

@@ -0,0 +1,22 @@
+- name: Install ola
+  become: true
+  ansible.builtin.apt:
+    name: ola
+
+- name: Ensure all given configuraton files are deployed
+  become: true
+  ansible.builtin.copy:
+    content: "{{ item.content }}"
+    dest: /etc/ola/{{ item.name }}.conf
+    mode: "644"
+    owner: olad
+    group: olad
+  loop: "{{ ola__configs }}"
+  notify: Restart olad
+
+- name: Enable and start ola service
+  become: true
+  ansible.builtin.systemd:
+    name: olad.service
+    state: started
+    enabled: true

roles/ola/templates/ola-ftdidmx.conf.j2

@@ -0,0 +1,2 @@
+enabled = {{ ola__enable_ftdi | string | lower }}
+frequency = 30