Consolidate all moonweb.org sites under www.moonweb.org

- Migrate timecapsule (old www.moonweb.org) into monorepo as Eleventy 2.x site
- Change all site URLs from subdomains to subdirectories under www.moonweb.org
- Replace Cloudflare Pages deployment with IONOS SFTP
- Update site-switcher, footer, and all internal links
- Add merge script for combining all sites into single deployment
- Update CI/CD workflow for IONOS SFTP deployment
- Update stefankoelle.de references to use new URLs
- Update AGENTS.md and README.md documentation

timecapsule/src/_data/nav.json

@@ -0,0 +1,18 @@
+[
+  [
+    "beginning"
+  ],
+  [
+    "projects",
+    "products",
+    "acoustics"
+  ],
+  [
+    "location",
+    "background",
+    "partners"
+  ],
+  [
+    "contact"
+  ]
+]

timecapsule/src/_data/site.json

@@ -0,0 +1,4 @@
+{
+  "domain": "https://www.moonweb.org/timecapsule",
+  "contactEmail": "webmaster@moonweb.org"
+}