[openstreetmap/openstreetmap-website] Set og:image:alt OpenGraph property (PR #5046)

[Andy Allan]

> which is unlikely because you can't do it with markdown syntax

Just as a side note, it's quite easy (and common) to skip the alt text with the markdown syntax, for example:

```
![](http://tile.osm.org/0/0/0.png)
```

Ref: https://spec.commonmark.org/0.31.2/#example-581

I'll leave it to you to decide if this is important enough to add more tests to cover this edge case.

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