with YAML-defined defaults. Add admin page for editing global settings. Add "site_description"
setting that would show as a paragraph on the frontpage

fix bug in process feed service

Deduplicating some logic and switching to pluck, to avoid pulling the entire model in memory.

h-feed, h-card and h-entry

for local attachments, use them in URLs. Check status privacy
before redirecting to actual file.

This allows other platforms such as Windows, macOS and iOS to use their system fonts rather than downloading a copy of Roboto. It also makes the app feel a little closer to native on those platforms!