README.md has link to documentation that doesn't exist

The readme page https://geusgitlab.geus.dk/egdi-public/egdi-documentation/-/blame/main/README.md?ref_type=heads#L7 has a link to non-existing documentation

A documentation (very preliminary) for end users can be found here: [End user documentation](https://geusgitlab.geus.dk/egdi-public/userdocumentation)