Miniflux 2.0.26

• Use created_at instead of published_at for archiving entries
• Add created_at field for entries
• Handle invalid feeds with relative URLs
• Add API routes for "mark all as read"
• Add support for setting a global default User-Agent
• Add rewrite rule "replace" for custom search and replace
• Calculate reading time during feed processing
• Handle various invalid dates
• systemd: keep /run writeable
• debian package: add missing post-install script
• Do not follow redirects when trying known feed URLs
• Trim spaces around icon URLs
• Reinstate EXPOSE instruction in Dockerfile
• Update German and Portuguese translations