Update docs for homeserver implementations (Conduit, Dendrite, and Synapse) (#3926)

* Update docs for Dendrite and Synapse: adopt the common section "Extending the configuration"

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

* Update docs/configuring-playbook-synapse.md: move down the section "Extending the configuration"

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

* Update docs for Dendrite and Synapse: remove redundant descriptions

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

* Update docs/configuring-playbook-conduit.md: add the common section "Extending the configuration"

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

* Update docs for Conduit and Dendrite: replace "Notes" with "Warnings" plus the warning symbol

The information is important and should deserve clear attention.

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

* Update docs/configuring-playbook-synapse.md: reorganize sections for adjusting the playbook configuration

As the section for Synapse Admin is not related to adjusting the configuration, it was moved out of the it

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

* Update docs/configuring-playbook-synapse.md: on Synapse Admin

Based on docs/configuring-playbook-bot-draupnir.md

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

* Update URLs of the forked Dendrite repository

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

* Update docs for Conduit and Dendrite: use the common descriptions for introductions

- Edit the instruction for adjusting the configuration

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

* Update docs/configuring-playbook-synapse-admin.md: update the URL of the Dendrite documentation

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

* Update docs/configuring-playbook-synapse.md: add the sections "Installing" and "Usage"

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

* Update docs/configuring-playbook-conduit.md: copy an instruction from roles/custom/matrix-conduit/defaults/main.yml

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

* Update docs for Conduit and Dendrite: fix capitalization

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

---------

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

docs/configuring-playbook-synapse-admin.md

@@ -2,7 +2,7 @@
 
 The playbook can install and configure [etkecc/synapse-admin](https://github.com/etkecc/synapse-admin) (a [feature-rich](https://github.com/etkecc/synapse-admin#fork-differences) fork of [Awesome-Technologies/synapse-admin](https://github.com/Awesome-Technologies/synapse-admin), community room: [#synapse-admin:etke.cc](https://matrix.to/#/#synapse-admin:etke.cc)) for you.
 
-synapse-admin is a web UI tool you can use to **administrate users, rooms, media, etc. on your Matrix server**. It's designed to work with the Synapse homeserver implementation and WON'T work with Dendrite because [Dendrite Admin API](https://matrix-org.github.io/dendrite/administration/adminapi) differs from [Synapse Admin API](https://element-hq.github.io/synapse/latest/usage/administration/admin_api/).
+synapse-admin is a web UI tool you can use to **administrate users, rooms, media, etc. on your Matrix server**. It's designed to work with the Synapse homeserver implementation and WON'T work with Dendrite because [Dendrite Admin API](https://element-hq.github.io/dendrite/administration/adminapi) differs from [Synapse Admin API](https://element-hq.github.io/synapse/latest/usage/administration/admin_api/).
 
 💡 **Note**: the latest version of synapse-admin is hosted by [etke.cc](https://etke.cc/) at [admin.etke.cc](https://admin.etke.cc/). If you only need this service occasionally and trust giving your admin credentials to a 3rd party Single Page Application, you can consider using it from there and avoiding the (small) overhead of self-hosting.