Clone the watched repository from Gitea by default (#21)

The repository moved to git.javagil.de, but repo-init still defaulted to
the GitHub mirror, which is no longer updated.
A freshly cloned instance therefore watched a stale main.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Co-authored-by: mhoennig <michael@hoennig.de>
Reviewed-on: #21

tools/remote

@@ -44,7 +44,7 @@
 # Optional in the env file:
 #   WERKATOR_INIT_CONFIG   the init fragment to apply (repo-init, instance-start)
 #   WERKATOR_REPO_URL      https clone URL of the watched repository
-#                          (default: https://github.com/mhoennig/werkator.git)
+#                          (default: https://git.javagil.de/mi/werkator.git)
 #   WERKATOR_REPO_DIR      directory of the watched repository, absolute or relative to
 #                          WERKATOR_PATH (default: werkator); it also names the systemd
 #                          unit, exactly as `init --systemd` derives it
@@ -122,7 +122,7 @@ require_env WERKATOR_REMOTE WERKATOR_PATH
 HOST="$WERKATOR_REMOTE"
 TARGET_DIR="$WERKATOR_PATH"
 ROOTFS="${WERKATOR_ROOTFS:-$REPO_ROOT/build/werkator-buildenv-trixie-java-go-node.tar.zst}"
-REPO_URL="${WERKATOR_REPO_URL:-https://github.com/mhoennig/werkator.git}"
+REPO_URL="${WERKATOR_REPO_URL:-https://git.javagil.de/mi/werkator.git}"
 
 # The host layout is three values, not one convention: an installation that grew
 # before this script existed puts them elsewhere, and the defaults are exactly what