work on documentation

docs/developers/debugging.md

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+# Debugging
+
+Set the log level with following environment variables:
+
+```sh
+RUST_LOG="debug"
+RUST_BACKTRACE=1
+```
+
+RustiCal also supports exporting opentelemetry traces to inspect with tools like [Jaeger](https://www.jaegertracing.io/).
+To enable you need to compile with the `opentelemtry` (or `debug`) feature and enable opentelemetry in the config with
+
+```toml
+[tracing]
+opentelemetry = true
+```

docs/developers/index.md

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+# Developers

docs/developers/rfcs.md

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+# RFCs
+
+Collection of RFCs relevant to this project
+
+- Versioning Extensions to WebDAV: [RFC 3253](https://datatracker.ietf.org/doc/html/rfc3253)
+  - provides the REPORT method
+- Calendaring Extensions to WebDAV (CalDAV): [RFC 4791](https://datatracker.ietf.org/doc/html/rfc4791)
+- Scheduling Extensions to CalDAV: [RFC 6638](https://datatracker.ietf.org/doc/html/rfc6638)
+  - not sur`e yet whether to implement this
+- Collection Synchronization WebDAV [RFC 6578](https://datatracker.ietf.org/doc/html/rfc6578)
+  - We need to implement sync-token, etc.
+  - This is important for more efficient synchronisation
+- iCalendar [RFC 2445](https://datatracker.ietf.org/doc/html/rfc2445#section-3.10)

docs/rfcs.md

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-# RFCs
-
-Collection of RFCs relevant to this project