Move mautrix telegram and whatsapp into separate roles

The goal is to move each bridge into its own separate role.
This commit starts off the work on this with 2 bridges:
- mautrix-telegram
- mautrix-whatsapp

Each bridge's role (including these 2) is meant to:

- depend only on the matrix-base role

- integrate nicely with the matrix-synapse role (if available)

- integrate nicely with the matrix-nginx-proxy role (if available and if
required). mautrix-telegram bridge benefits from integrating with
it.

- not break if matrix-synapse or matrix-nginx-proxy are not used at all

This has been provoked by #174 (Github Issue).

roles/matrix-synapse/defaults/main.yml

@@ -1,3 +1,8 @@
+# Synapse is a Matrix homeserver
+# See: https://github.com/matrix-org/synapse
+
+matrix_synapse_enabled: true
+
 matrix_synapse_docker_image: "matrixdotorg/synapse:v0.99.3.2"
 
 matrix_synapse_base_path: "{{ matrix_base_data_path }}/synapse"
@@ -239,31 +244,6 @@ matrix_s3_media_store_region: "eu-central-1"
 # Controls whether the self-check feature should validate SSL certificates.
 matrix_synapse_self_check_validate_certificates: true
 
-# Matrix mautrix is a Matrix <-> Telegram bridge
-# Enable telegram bridge
-matrix_mautrix_telegram_enabled: false
-
-matrix_mautrix_telegram_docker_image: "tulir/mautrix-telegram:v0.5.1"
-
-matrix_mautrix_telegram_base_path: "{{ matrix_base_data_path }}/mautrix-telegram"
-
-# Get your own API keys at https://my.telegram.org/apps
-matrix_mautrix_telegram_api_id: YOUR_TELEGRAM_APP_ID
-matrix_mautrix_telegram_api_hash: YOUR_TELEGRAM_API_HASH
-# Mautrix telegram public endpoint to log in to telegram
-# Use an uuid so it's not easily discoverable
-matrix_mautrix_telegram_public_endpoint: "/{{ matrix_synapse_macaroon_secret_key | password_hash('sha512', 'telegram') | to_uuid }}"
-# Set this to a port number to expose on the host when not using the nginx proxy
-matrix_mautrix_telegram_container_exposed_port_number: ~
-
-# Matrix mautrix is a Matrix <-> Whatsapp bridge
-# Enable whatsapp bridge
-matrix_mautrix_whatsapp_enabled: false
-
-matrix_mautrix_whatsapp_docker_image: "tulir/mautrix-whatsapp:latest"
-
-matrix_mautrix_whatsapp_base_path: "{{ matrix_base_data_path }}/mautrix-whatsapp"
-
 # Matrix mautrix is a Matrix <-> Facebook bridge
 # Enable facebook bridge
 matrix_mautrix_facebook_enabled: false