* Include eturnal TURN server configuration example

and moving specific configuration examples into sub folders.

* Update docs/turn-howto.md

Co-authored-by: Dirk Klimpel <5740567+dklimpel@users.noreply.github.com>

* Update docs/setup/turn/coturn.md

Co-authored-by: Dirk Klimpel <5740567+dklimpel@users.noreply.github.com>

* Update docs/setup/turn/eturnal.md

Co-authored-by: Dirk Klimpel <5740567+dklimpel@users.noreply.github.com>

* Fix TURN relaying public IP address hint

* lint eturnal installation commands

* Adjust synapse setup to link to existing documentation

..avoid redundant information.

* remove redundant text

* include alpine linux package link

* Create 14293.doc

* Update 14293.doc

add missing dot

* Update docs/setup/turn/eturnal.md

Co-authored-by: reivilibre <olivier@librepush.net>

* Update docs/setup/turn/eturnal.md

Co-authored-by: reivilibre <olivier@librepush.net>

* Update docs/setup/turn/coturn.md

Co-authored-by: Moritz Dietz <moritzdietz@users.noreply.github.com>

* Update docs/setup/turn/coturn.md

Co-authored-by: Moritz Dietz <moritzdietz@users.noreply.github.com>

* Update docs/setup/turn/coturn.md

Co-authored-by: Moritz Dietz <moritzdietz@users.noreply.github.com>

* Update docs/setup/turn/eturnal.md

Co-authored-by: reivilibre <olivier@librepush.net>

* Update docs/setup/turn/coturn.md

Co-authored-by: Moritz Dietz <moritzdietz@users.noreply.github.com>

* Update docs/setup/turn/coturn.md

Co-authored-by: Moritz Dietz <moritzdietz@users.noreply.github.com>

* Update eturnal.md to link to official documentation

... and to simplify some aspects

* Adjust coturn to link to default prefix

* Mention eturnalctl location

* Update docs/turn-howto.md

Co-authored-by: Saarko <sandomir@tutanotal.com>
Co-authored-by: Dirk Klimpel <5740567+dklimpel@users.noreply.github.com>
Co-authored-by: reivilibre <olivier@librepush.net>
Co-authored-by: Moritz Dietz <moritzdietz@users.noreply.github.com>