Migrate to new Gitea instance (gitea.wbd-rd.nl)

- Update all submodule URLs from gitea.centraal.wbd-rd.nl to gitea.wbd-rd.nl
- Add settler as proper submodule in .gitmodules
- Add agent skills, function anchors, decisions, and improvements
- Add Docker configuration and scripts
- Add manuals and third_party docs
- Update .gitignore with secrets and build artifacts
- Remove stale .tgz build artifact

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

.gitignore

@@ -1,3 +1,10 @@
-# EVOLV/.gitignore
-node_modules/
-npm-debug.log*
+# EVOLV/.gitignore
+node_modules/
+npm-debug.log*
+
+# Secrets / tokens
+.env
+.env.*
+
+# Build artifacts
+*.tgz