Restructure to match the Stratum wiki's own pattern
Stratum's wiki (StratumServer/Stratum.wiki) uses absolute wiki URLs for
every internal link rather than relative page names, skips the
redundant H1 on every page but Home (the wiki chrome already shows the
page title), has no _Sidebar.md and instead routes navigation through
Home's own Pages list plus Related Pages footers on the top-level
pages, and documents two rules directly on Home: a Writing Rule (don't
state what you can't verify as fact) and a Page Naming Rule (keep
filenames clonable on Windows). Adopted all four here.
Home.md rewritten to the same shape: Pages, Source of Truth, Reading
Order, Writing Rule, Page Naming Rule. Removed _Sidebar.md. Dropped the
leading H1 from every other page. Added Related Pages footers to the
five top-level pages (What is RiftLauncher, Installation, Usage, Game
Client, Translation), left the leaf pages without one, matching how
Stratum's own Feature-*.md deep dives don't carry one either.
Write the RiftLauncher wiki: installation, usage and translation guides
Replaces the placeholder home page with a full player-facing wiki,
migrated from the GitBook-flavored docs under docs/get-started/ in the
main repository and rewritten in plain Markdown for GitHub's wiki
renderer. Dropped GitBook-only shortcodes (stepper, hint, embed,
content-ref), stale VS Launcher identity-migration warnings that PRs
#71/#114/#160 already resolved, and a stale, low-resolution release-page
screenshot showing an old 0.0.4 build in favor of describing the
Releases page in text so it doesn't go stale the same way.
Scope: installation (Windows/Linux/macOS), usage (concepts and the
eight game-client guides), translation (both onboarding paths),
contributors and the roadmap pointer. Left the contributor-facing
architecture and shell-decision docs out, since this wiki is what the
in-app Guides link points to and those aren't player-facing content;
they stay in docs/ for contributors.