Add various polish to Conduwuit

https://github.com/Virkkunen and I have been working on the same feature
simultaneously.

This patch adds my additional independent work on top of his changes.

Notable changes here compared to Virkkunen's original work:

- renaming config-related variables (`matrix_conduwuit_*` ->
  `matrix_conduwuit_config_*`). This is consistent with other roles (and
  better), but deviates from how the Conduit role was implemented.

- using a full configuration sample from https://conduwuit.puppyirl.gay/configuration.html
  instead of using the old Conduit config file template

- introducing configurability for more Conduwuit config settings, to support easy registration, etc.

- removing configuration settings that Conduwuit does not support
  anymore (e.g. `max_concurrent_requests`)

- cross-linking docs pages for Conduit and Conduwuit

- a Conduwuit docs page which is much improved compared to the old
  Conduit one

- REAMDE updates

roles/custom/matrix-conduwuit/tasks/main.yml

@@ -10,11 +10,20 @@
       ansible.builtin.include_tasks: "{{ role_path }}/tasks/validate_config.yml"
 
     - when: matrix_conduwuit_enabled | bool
-      ansible.builtin.include_tasks: "{{ role_path }}/tasks/setup_install.yml"
+      ansible.builtin.include_tasks: "{{ role_path }}/tasks/install.yml"
 
 - tags:
     - setup-all
     - setup-conduwuit
   block:
     - when: not matrix_conduwuit_enabled | bool
-      ansible.builtin.include_tasks: "{{ role_path }}/tasks/setup_uninstall.yml"
+      ansible.builtin.include_tasks: "{{ role_path }}/tasks/uninstall.yml"
+
+- tags:
+    - self-check
+  block:
+    - when: matrix_conduwuit_enabled | bool
+      ansible.builtin.include_tasks: "{{ role_path }}/tasks/self_check_client_api.yml"
+
+    - when: matrix_conduwuit_enabled | bool
+      ansible.builtin.include_tasks: "{{ role_path }}/tasks/self_check_federation_api.yml"