[openstreetmap/openstreetmap-website] Add geoblock zones where anynomous notes are not allowed (PR #6713)

[Minh Nguyễn]

1ec5 left a comment (openstreetmap/openstreetmap-website#6713)

I think the discussions that led us here were focused on arbitrary regions, or at least proximity to a certain location. Blocking an administrative boundary per se might be of less interest for notes specifically, but I could see that being potentially relevant for other kinds of blocking.

> super fast geocoders (including one used by iD)

To elaborate, iD uses [country-coder](https://github.com/rapideditor/country-coder/), which stores simplified country boundaries in a [which-polygon](https://github.com/mapbox/which-polygon/) spatial index, which in turn is based on [RBush](https://github.com/mourner/rbush/), which is an R-tree implementation, like PostGIS.

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