Make custom archive pages embeddable

[neoground]

Make it possible to add custom archive pages with custom content (graphs + values selection) + date range. Also custom view without navbar and so on.

Those pages should be embeddable into other websites via iframe or so, ideally GDPR-compliant.

So you could for example write a blog post about some special weather condition and then embed the data below, also referencing your weather station website to a broader audience.