Update docs/configuring-playbook-jitsi.md: remove a mention about the unmaintained Dimension integration manager

As Dimension has been officially declared to be unmaintained and we have stopped recommending to install it since 4574ebbd31888c26dc72a9449e8b6c7427e8bc3f, it is a reasonable choice to remove the explanation which suggests to add a Jitsi widget with the component.

Signed-off-by: Suguru Hirahara <acioustick@noreply.codeberg.org>

docs/configuring-playbook-jitsi.md

@@ -217,8 +217,6 @@ You can use the self-hosted Jitsi server in multiple ways:
 
 - **by adding a widget to a room via Element Web** (the one configured by the playbook at `https://element.example.com`). Just start a voice or a video call in a room containing more than 2 members and that would create a Jitsi widget which utilizes your self-hosted Jitsi server.
 
-- **by adding a widget to a room via the Dimension integration manager**. You'll have to point the widget to your own Jitsi server manually. See our [Dimension integration manager](./configuring-playbook-dimension.md) documentation page for more details. Naturally, Dimension would need to be installed first (the playbook doesn't install it by default).
-
 - **directly (without any Matrix integration)**. Just go to `https://jitsi.example.com`
 
 ### Set up Additional JVBs (optional)