[openstreetmap/openstreetmap-website] Don't include unused bootstrap css (PR #4250)

[Anton Khorev]

> Can you expand on this please, perhaps with an example?

https://getbootstrap.com/docs/5.1/customize/sass/#add-to-map

You can't add to the theme map before it's defined. Then you may try to include Bootstrap first, but if you include everything, it's too late to modify the map.

Something like this would work, if there's an editable file with Bootstrap includes:

```
// Configuration
@import "bootstrap/functions";
@import "bootstrap/variables";
@import "bootstrap/mixins";
@import "bootstrap/utilities";

$theme-colors: map-merge($theme-colors, $custom-colors); // added custom themes

// Layout & components
@import "bootstrap/root";
@import "bootstrap/reboot";
@import "bootstrap/type";
@import "bootstrap/images";
...
```

Or do you prefer to redefine the entire theme map instead of adding to it?


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