Bad links from PR #3482

[MikeMcC399]

1. There are bad links in this PR regarding sitemap changes and link to NINA. Check with npm run test:links

[RESPONSE 404] http://localhost:8000/de/blog/2023-05-02-funktionsreduzierung hostname: localhost on '/de/sitemap/' 
[RESPONSE 404] http://localhost:8000/en/blog/2023-05-02-funktionsreduzierung hostname: localhost on '/en/sitemap/' 
[RESPONSE 404] https://bbk.bund.de/DE/Warning-Prevention/Warning-App-NINA/warn-app-nina_node.html hostname: bbk.bund.de on 'http://localhost:8000/en/blog/2023-05-02-reduction-of-functions' 

• The blog is located at https://www.coronawarn.app/en/blog/2023-05-02-reduction-of-functions/ and https://www.coronawarn.app/de/blog/2023-05-02-reduction-of-functions/
• https://www.bbk.bund.de/EN/International-Visitors/international-visitors_node.html is an English language link for NINA

2. The German abbreviation z.B. is supposed to have a   in it.

Originally posted by @MikeMcC399 in https://github.com/corona-warn-app/cwa-website/issues/3482#issuecomment-1531165800

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