[openstreetmap/openstreetmap-website] Improve HTTPS security (#3108)

[Nukeador]

Hi,

According to the Mozilla Observatory, openstreetmaps.org has some misconfigurations that can degrade the HTTPS security on the site:

https://observatory.mozilla.org/analyze/openstreetmap.org 

![image](https://user-images.githubusercontent.com/531906/108499923-5670ac00-72af-11eb-8865-a1f5364d07c2.png)

Cheers.

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