Generate documentation pages for properties

[Raphael-Gazzotti]

Related to #44

We should start to generate individual pages for each property. This will help us document them properly and make sure their URLs can be resolved in the future when we need to link to them.

The idea is to give each property its own space with the relevant info (like name, description, type, etc.). This information is already available in the central repository of OpenMINDS in the vocab (i.e., properties.json file).

[lzehl]

I would suggest to make a new page in the navigation menu ("Properties" or "Property specifications" or "Property vocabularies").

Then we need to decide if each property gets its own subpage or if each property is defined as subsection on the same page (cf. instance libraries). I tend to the latter. We could also do a mix of both and group alphabetically.

@openMetadataInitiative/openminds-developers your preferences??