Seed: Grav pages content for performance.knownelement.com (#826)

https://projects.knownelement.com/issues/826#note-12

README.md

@@ -0,0 +1,33 @@
+# ⚡ KNELPerfHub — content for performance.knownelement.com
+
+> The Grav site at
+> [performance.knownelement.com](https://performance.knownelement.com)
+> **pulls its pages from this repo**. Publishers push; the site never runs
+> foreign tooling.
+
+![license](https://img.shields.io/badge/license-AGPLv3-blue)
+
+## Flow
+
+```mermaid
+flowchart LR
+    S[📡 scrapers/collectors<br/>KNELPerf + SITER-Solar tooling] --> P[📝 grav-publish.sh<br/>renders pages, git push]
+    P --> R[📦 this repo] -->|host-side git pull every 5 min<br/>no container execs| G[🌐 Grav<br/>cache.check=file]
+```
+
+- Publishing = commit markdown to this repo (bash only; house rules).
+- The Cloudron VPS runs a systemd timer that `git pull`s this repo into the
+  Grav pages dir (public repo → plain HTTPS, no deploy keys).
+- Grav's `cache.check.method: file` picks changes up automatically — the
+  app container executes nothing but its own PHP.
+
+## Layout
+
+- `01.home/` — site landing page
+- `performance/` — auto-published dashboard (ERCOT risk, arbitrage verdict,
+  baseline index) + reports
+- `02.typography/` — theme demo (from the Grav skeleton; removable)
+
+Work tracking: [Redmine #826](https://projects.knownelement.com/issues/826)
+
+> **Docs live on Discourse — this repo is the executable source of truth.**