Move matrix-homeserver to dedicated repository

configuration.nix

flake.lock

flake.nix

modules/default.nix

modules/matrix-homeserver/coturn.nix

modules/matrix-homeserver/default.nix

modules/matrix-homeserver/element.nix

modules/matrix-homeserver/heisenbridge.nix

modules/matrix-homeserver/matrix-synapse.nix

modules/matrix-homeserver/postgresql.nix

modules/matrix-homeserver/recommended-settings.nix

modules/matrix-homeserver/reverse-proxy.nix

modules/matrix-homeserver/well-known.nix