refactor: normalize Jinja2 spacing in volume paths and add async support in backup task

- Standardized spacing in {{ docker_compose.directories.volumes }} across multiple roles
- Added async and poll support to sys-bkp-docker-2-loc database seeding and file permission tasks
- Moved Installation.md for web-app-matrix into docs/ for better structure

roles/web-app-matrix/docs/Installation.md

@@ -0,0 +1,21 @@
+# Installation
+
+## Bridges
+
+### Mautrix 
+Contact one of the following bots for more information:
+
+- @signalbot:yourdomain.tld
+- @telegrambot:yourdomain.tld
+- @whatsappbot:yourdomain.tld
+- @slackbot:yourdomain.tld
+
+#### Slack
+For login with Token checkout [this guide](https://docs.mau.fi/bridges/go/slack/authentication.html).
+
+### ChatGPT
+- Create API Token: https://platform.openai.com/api-keys
+- Set ``applications | get_app_conf(application_id, 'credentials.chatgpt_bridge_access_token', True)`` 
+
+## Debug:
+- https://federationtester.matrix.org/