Ability to add extra routes and related templates

[clausjuhl]

Hi Simon

Thank for an excellent job! Datasette is such an obviously good idea (once you have that idea!) and so well done. The only thing that I miss, is the ability to add extras routes (with associated jinja2-templates). For most of the datasets, that I would like to publish, I would also like at least a page, that describes the data (semantics, provenance, biases...) and a page explaining our cookie- and privacy-policies (which would allows us to use something like Goggle Analytics).

[simonw]

I'm really keen to offer this as a plugin hook once I have Datasette working on ASGI - #272

I'll hopefully have that working in the next few weeks, but in the meantime there are a couple of tricks you can use:

• you can add static HTML files (no templates though) using the static route configuration options
• you can link to external hosted pages using the about_url metadata option
• you can add information to an existing page with a custom template. I do that here for example: https://russian-ira-facebook-ads.datasettes.com/

[simonw]

Closing this as a dupe of #215