Initial work on matrix-homeserver-proxy role and eliminating matrix-nginx-proxy

This is still very far from usable.

Various bridges and bots are still talking to
`matrix-nginx-proxy` instead of the new `matrix-homeserver-proxy` role.
These services need to be reworked. While reworking them,
various cleanups are being done as well as adding Traefik-labels to
those that need them.

roles/custom/matrix-homeserver-proxy/tasks/main.yml

@@ -0,0 +1,20 @@
+---
+
+- tags:
+    - setup-all
+    - setup-homeserver-proxy
+    - setup-synapse
+    - install-all
+    - install-homeserver-proxy
+    - install-synapse
+  block:
+    - when: matrix_homeserver_proxy_enabled | bool
+      ansible.builtin.include_tasks: "{{ role_path }}/tasks/install.yml"
+
+- tags:
+    - setup-all
+    - setup-homeserver-proxy
+    - setup-synapse
+  block:
+    - when: not matrix_homeserver_proxy_enabled | bool
+      ansible.builtin.include_tasks: "{{ role_path }}/tasks/uninstall.yml"