docs: launch post draft for repo flip

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docs/announcement.md

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+# v1.0.0 launch post — draft
+
+For r/selfhosted, HN Show, and similar. Edit freely before posting.
+
+---
+
+**Title:** Dash — a self-hosted homelab dashboard with monitoring built in.
+Single Go binary, no YAML, no auth.
+
+**Body:**
+
+I built Dash because my homelab had outgrown a bookmark page: I wanted service
+links, uptime checks, domain expiry, server stats, and a status page — without
+running five separate tools or maintaining a YAML file.
+
+What it does:
+
+- **Board** — drag-and-drop service grid, multiple layouts, dark/light, icon
+  upload. Imports your existing Homepage (`services.yml`), Homarr, or Dashy
+  config in one click.
+- **Monitors** — HTTP/TCP/ping/DNS/keyword/JSON-path checks plus push monitors
+  for cron jobs. Webhook alerts (Slack/Discord/ntfy). Uptime history.
+- **Domains** — WHOIS/RDAP, DNS, TLS certificate expiry, provider detection.
+  Inspired by Domain Locker, minus the paid APIs.
+- **Systems** — a ~4 MB static agent pushes CPU/mem/disk/net/temps/Docker
+  container states. Inspired by Beszel, push-JSON instead of SSH.
+- **Ops** — incidents, maintenance windows, public status pages, SVG badges,
+  Prometheus `/api/metrics`.
+
+Deployment is one container:
+
+```sh
+docker run -d -v ./data:/data -p 3000:3000 ghcr.io/dvorinka/dash:latest
+```
+
+SQLite inside, no database to babysit, no accounts. Deliberately no auth —
+it expects a trusted LAN or your own proxy in front.
+
+Stack: Go + Gin + SQLite (single static binary serving an embedded React UI).
+MIT licensed.
+
+Repo: https://github.com/Dvorinka/Dash
+Screenshots are in the README.
+
+Happy to answer questions — feedback welcome, especially on which monitor
+types or integrations to add next.
+
+---
+
+**HN variant (Show HN guidelines — terse):**
+
+Show HN: Dash – self-hosted homelab dashboard with monitoring, one Go binary
+
+Dash combines a service board, uptime monitors, domain/SSL watching, system
+metrics via a tiny push agent, and public status pages. Single container or
+single binary, SQLite storage, no YAML, no auth (LAN-trust model). MIT.
+https://github.com/Dvorinka/Dash