Pipe v0.50.4

A plainer website

• The website and the documentation changed color: a verdigris green replaced the blue on buttons, links and the
  diagrams, on a lighter graphite background
• Removed the decoration: the background grid, the moving light under the header, the pulsing dot in the menu, the
  all-caps labels, the tinted quotes and the arrow on the button
• The documentation start page lists its pages in a plain list, without cards and without the pipe animation
• The home page now shows the valve first, with what Pipe does on its own and what it asks about, and the whole pipe
  further down, next to where you talk to it. The text around both was rewritten to match
• New headline, also in both READMEs: "Pipe looks after your Linux server and messages you when something breaks"
• New link preview images, dark, with the new headline, showing that routine fixes run on their own and important
  changes wait for your yes

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Images (linux/amd64, linux/arm64):

docker pull ghcr.io/kvmyk/pipe:0.50.4
docker pull ghcr.io/kvmyk/pipe-telegram:0.50.4

Signature (cosign, keyless):

cosign verify ghcr.io/kvmyk/pipe:0.50.4 \
  --certificate-identity-regexp '^https://github.com/Kvmyk/Pipe/\.github/workflows/release\.yml@' \
  --certificate-oidc-issuer https://token.actions.githubusercontent.com