feat(docs): move the site to prdcs.wiki on a Cloudflare Worker

Blume's cloudflare() adapter builds the docs as the prdcs-wiki Worker
(apps/docs/wrangler.jsonc: name, prdcs.wiki custom domain), and deploy.yml
ships it with wrangler instead of GitHub Pages. The SRS Worker's DOCS_URL /
DOCS_ORIGIN, release links and README badge follow the new domain.

package.json

@@ -7,6 +7,7 @@
     "prepare": "git config core.hooksPath .githooks",
     "dev": "cd apps/docs && bun run dev",
     "build": "cd apps/docs && bun run build",
+    "docs:deploy": "cd apps/docs && bun run deploy",
     "doctor": "cd apps/docs && bun run doctor",
     "close-solved": "bun apps/cli/close-solved.ts",
     "close-topics": "bun apps/cli/close-topics.ts",