docs: align content with SwissKnife v0.2.0

[darioAnongba]

Summary

Aligns the documentation content with the current SwissKnife v0.2.0 (companion to the dependency upgrade in #8). Produced by auditing all 21 doc pages against the live SwissKnife sources — CHANGELOG.md, config/default.toml, the OpenAPI spec, the Dockerfiles, README.md, and the backend source — then applying the fixes per file.

What changed (14 pages + announcement bar)

• Lightning providers — removed discontinued Breez / Greenlight / Liquid / Spark (and never-supported Phoenix / Lightspark); documented Core Lightning and LND, each over gRPC and REST; fixed ln_provider values (cln_grpc / cln_rest / lnd_grpc / lnd_rest); noted base64-encoded macaroon support.
• On-chain Bitcoin wallet — added across features / intro / config / usage (address management, wallet sync, transaction preparation; bitcoin_address_type, /v1/bitcoin/addresses).
• Configuration — replaced the stale embedded default.toml; corrected the auth table (the admin password is set via the sign-up flow, not config); added lnd_grpc_config, bitcoin_address_type, dashboard_dir, database.url / busy_timeout; removed nonexistent keys (retry_delay, ws_*_reconnect_delay); documented OAuth2/OIDC discovery; corrected DB support (PostgreSQL + SQLite, SQLite is the default).
• Deployment — replaced the "private registry" page with the public Docker Hub images (swissknife :3000 bundle, swissknife-server :3000, swissknife-dashboard :8080), tags, build targets, and the Kubernetes image split.
• Developers — fixed the broken github.com/swissknife/issues link; marked webhooks clearly as not-yet-available (no webhook API exists in v0.2.0).
• Authored two guides — swissknife/usage (sign-in, balance, receive over Lightning invoice / address / LNURL / Nostr / on-chain, send, on-chain wallet, API keys — every endpoint, scope, and field verified against the OpenAPI spec) and swissknife/architecture (layered/DDD design, the provider abstraction, persistence, auth, the HTTP server + event listener, deployment topology).
• Other — announcement bar bumped to v0.2.0; removed present-tense RGB / smart-contract claims.

Left intact (by decision)

• docs/account/* and the hosted "Numeraire Account" framing in introduction.md — these document the real hosted Numeraire SaaS (app.numeraire.tech), not the self-hosted software.

Verification

✅ yarn build passes (Docusaurus — no broken links, no MDX errors). The authored usage guide's API claims were spot-checked against openapi.json (endpoint paths, Balance fields incl. fees_paid_msat, the permission scopes, and the case-insensitive api-key header).

Notes / follow-up

• The audit surfaced a code bug in swissknife/Makefile: the run-docker target maps 5000:5000 but the app binds 3000 — worth a separate fix in the swissknife repo. The docs now show the correct -p 3000:3000.
• Merge after build(deps): upgrade Docusaurus 3.10, React 19, eslint 9 flat config #8 (the deps upgrade) or rebase onto it; the content builds on both Docusaurus 3.5 and 3.10.

Closes #7.

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