[openstreetmap/openstreetmap-website] Add Human facing error messages when users without WebGL use (PR #6782)

[Frank Elsinga]

CommanderStorm left a comment (openstreetmap/openstreetmap-website#6782)

I'm not really sure what a non-WebGL render path would look like in practice.
All modern browsers have webgl enabled, so it should not be an issue for users.

MapLibre GL is fundamentally built around a GPU rendering pipeline.
Without WebGL, we'd effectively need to implement and maintain a second renderer (or significantly reduce functionality), which is a very large undertaking.

For the current architecture, if we can't obtain a GPU-backed canvas, failing early with a clear error is the only sensible option.

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