Use a static link of content/newsletter-next.md for the next newsletter.

[therealprof]

This allows us to not worry too much about publication dates beforehand and also no matter which newsletter people are looking at, there'll be always a valid link to go to submit new content.

Signed-off-by: Daniel Egger daniel@eggers-club.de

[rust-highfive]

r? @andre-richter

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[bors[bot]]

Build succeeded:

• build