readme and docs site: v0.4.0 release status, release news section, masthead tagline, and accuracy pass

- v0.4.0 status framing (the most complete release to date; the common
  defect classes fixed; a short list of known caveats) and the pre-1.0
  note, on both the README and the Pages home page.
- Dated release news section with links to the GitHub release tags.
- Keyword-reinforced meta descriptions; site masthead tagline.
- Accuracy: options section list per the shipped overlay, Xbox 1.1 (Jinx)
  controller roles (D394), Select opens the overlay, Deck 2x MSAA / 250%
  preset, background stats, footer last-updated stamp.

docs/_config.yml

@@ -6,7 +6,7 @@ title: GoldenEye 007 PC Port
 # long version made a ~230-char title. It also renders as the masthead
 # tagline on every page. Per-page meta/og descriptions come from each page's
 # front matter `description:` (see index.md), not from here.
-description: N64 GoldenEye 007, decompiled for PC.
+description: GoldenEye 007 (Nintendo 64, 1997) on the PC - decompiled, ported, and playable.
 # No GitHub theme: the site uses a hand-rolled _layouts/default.html plus the
 # design in _includes/head-custom.html (charcoal/off-white/amber, square and
 # flat.)