v0.5.0

A page and a panel for people who know nothing about Git, and the deck's cover names its licence.

Added

• A page for people who know nothing about Git, or coding, at /new-to-git: what Git is, as a tower built by many hands; the five things that go wrong and Git's words for them; how a game goes; the words, one line each. The landing page gains a highlighted plain-words panel right after the hero that leads to it, and every header a "new to Git?" link, first.

Changed

• The print-and-play deck's cover names its licence, CC BY-SA 4.0 (ADR-0010), and where the deck came from, so a printed copy carries both.