[openstreetmap/openstreetmap-website] Various CSS fixes (#2497)

[Andy Allan]

> probably unintentionally

It was actually deliberate, but I'm not too fussed either way :-) I think the horizontal lines that stretch beyond the left-most character of the heading makes it look like the heading is part of one of the items.

```
  heading

  stuff
---- divider ---
  stuff

  heading

  stuff
---- divider ---
  stuff
---- divider ---
  stuff
```
The above looks like a single list of four items with three dividers to me.
```
  heading

    stuff
  ---- divider
    stuff

  heading

    stuff
  ---- divider
    stuff
  ---- divider
    stuff
```
The above looks more like two lists, with a header before each list and dividers between the list items. 

But like I say, there's perhaps bigger things to worry about! Just thought I should explain my reasoning.

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