Small improvements:

- Switch to CodeMirror
- Switch to Parcel Bundler
- Fix synchronisation bug
- Update dependencies

Caddyfile

@@ -0,0 +1,9 @@
+https://notes.dev.hibas123.de:443 {
+   proxy / localhost:1234/
+   tls D:\Certs\_wildcard.dev.hibas123.de.pem D:\Certs\_wildcard.dev.hibas123.de-key.pem
+}
+
+https://sf.dev.hibas123.de:443 {
+   proxy / localhost:3004/
+   tls D:\Certs\_wildcard.dev.hibas123.de.pem D:\Certs\_wildcard.dev.hibas123.de-key.pem
+}