Add map to constituency area page

[juliacush]

Placement suggestion and conversation here: https://docs.google.com/document/d/11VQPRSurXI9tdq1FD-ZnuPa0Feu7Vv-LCFQe_POUz-A/edit#heading=h.udir1vimsjpx

Zarino
What information do you think people will find on a map? (Not arguing, just finding out more, so we can decide how big / where to put the map.)

Julia
Maps are nice, more visual interest! but also, if you are using the postcode of a campaigner trying to find out about an area, you genuinely might not know where South Holland and the Deepings is!

Zarino
Your screenshot suggests the map should show one (or more?) of the 2010 constituencies that this 2023 constituency overlaps – is that right?

Julia
I think I'm leaning towards no, but could be useful for the first 3 months or so?

[zarino]

In terms of requirements, it feels like the key two are:

• A fairly zoomed in (interactive, so you can zoom further?) map showing the constituency boundary, and the towns / cities inside it, to orient yourself
• A very very zoomed out thumbnail of the UK, showing the constituency’s rough location relative to the country as a whole

My instinct is to put it near the top of the page (since it’s sort of introductory / scene-setting about the constituency) and away from the other datasets (since this isn’t actually a dataset), but I wonder whether that’s too prominent?

Could potentially combine with #570 to provide a toggle that shows the boundaries of overlapping area types, and make those boundaries clickable, to navigate to those other areas. 🤷