UwUMail Server 0.21.2

Webmail 0.21.2 (bundled): its own font, UwU Sans (based on Atkinson Hyperlegible Next, with
Nyu as a character: ":3" becomes Nyu and "<3" a heart, never in times like 10:30 and never while
typing), and a font picker under Settings → Appearance (UwU Sans, Rubik, DM Sans or the system
font, kept on the device).

Fixed

• HTML mails without a font of their own no longer show up in Times. They get the chosen font;
  under Settings → Reading → Sender fonts, serif fonts like Times or Georgia are replaced by it
  too (can be turned off), and a missing Calibri or Aptos falls back to it.