Metran

Updated documentation, fixes for pandas>2.0 and pastas>=1.4.0.

What's Changed
* Metran release 0.4.0 by dbrakenhoff in https://github.com/pastas/metran/pull/27


**Full Changelog**: https://github.com/pastas/metran/compare/v0.3.0...v0.4.0

**Full Changelog**: https://github.com/pastas/metran/compare/v0.2.0...v0.3.0

New Contributors
* martinvonk made their first contribution in https://github.com/pastas/metran/pull/7
* bdestombe made their first contribution in https://github.com/pastas/metran/pull/9

**Full Changelog**: https://github.com/pastas/metran/compare/v0.1.2...v0.2.0

Hopefully got it all right for PyPI now. No internal changes as compared to v0.1.0 and v0.1.1

I'm gonna keep bumping micro versions till the publish package workflow works.

This is the first official release for `metran`.

For features, see notebooks in the examples and concepts sections!