[openstreetmap/openstreetmap-website] Refactor social sharing helper (PR #5417)

[Anton Khorev]

Looks like `&` gets unescaped in mastodonshare.com's redirect location.

Request headers:
```
GET /?text=A%26B&url=http%3A%2F%2F127.0.0.1%3A3000%2Fuser%2Ffakeuser1%2Fdiary%2F86 HTTP/1.1
Host: mastodonshare.com
...
```

Response headers:
```
HTTP/1.1 302 Found
...
Location: https://en.osm.town/share?text=A&B%0A%0Ahttp://127.0.0.1:3000/user/fakeuser1/diary/86
```

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