[openstreetmap/openstreetmap-website] Update heading, stripes and tab border colors (PR #4658)

[Anton Khorev]

Here's the easiest change - add border to every heading section + negative margin to tabs:

![image](https://github.com/openstreetmap/openstreetmap-website/assets/4158490/b8cf8280-504d-4f2b-9d7b-5d5f94873c2e)

I can change negative margin to `calc(-1 * var(--bs-border-width))` to avoid pixel widths in css.

Other options are:
- same but with top border for every heading too
- bottom border only for headings with tabs

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