Fix regex in matrix_appservice_webhooks_registration_yaml

Related to #339 (Github Pull Request).

Add matrix-appservice-webhooks role.

Upgrade riot-web (1.5.6 -> 1.5.7)

Regression introduced in 53186ffa1c

NeDB is deprecated, so we should transition away from it in the future.
Still, most of the functionality should work on this new version.

Remove spurious 'mxisd' string from mautrix bridge templates comment

Notes when not using a ssh key for authentication

Fixed small typo, added an extra note on how to use the ansible docker image when not using a ssh key for authentication

Update configuring-playbook-bridge-mautrix-telegram.md

typographical error

Update synapse (1.7.2 -> 1.7.3)

Related to #330 (Github Issue).

Fixes #330 (Github Issue).

Expose self service bridging in matrix_appservice_discord

This allows for users to bridge already existing matrix rooms to discord

Added Traefik configuration example to own webserver docs

Implement MSC1957: Integration manager discovery