More content and playbooks

* more readme.md content
* imported basic roles
* commented said basic roles
* trimmed down playbooks to be understandable
* update requirements.txt deps

roles/root_user/tasks/main.yml

@@ -0,0 +1,28 @@
+---
+# Ensures the .ssh directory exists
+- name: "creates the .ssh root directory"
+  file:
+    path: "/root/.ssh"
+    state: directory
+    owner: root
+    group: root
+    mode: 0700
+- name: "Install root SSH keys"
+  template:
+    src: authorized_keys.j2
+    dest: /root/.ssh/authorized_keys
+    owner: root
+    group: root
+    mode: 0600
+# Delete users you don't need
+# respectively you can also *add* users
+# https://docs.ansible.com/ansible/latest/collections/ansible/builtin/user_module.html#ansible-collections-ansible-builtin-user-module
+- name: "Delete usual cloud users user"
+  user:
+    name: "{{ item }}"
+    state: absent
+    remove: true
+  with_items:
+    - pi
+    - admin
+    - ubuntu

roles/root_user/templates/authorized_keys.j2

@@ -0,0 +1,4 @@
+{% for key in root_user.default_root_keys %}
+# {{ key.name }}
+{{ key.key }}
+{% endfor %}