docs: add docs/ index page linking the CLI guide and design docs

There was no landing page for the docs/ folder. Add docs/README.md (which
GitHub renders as the folder front page) with a one-line description of
each doc, including the new CLI guide.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

Author: AlpineArchitecture

docs/README.md

@@ -0,0 +1,11 @@
+# Programmarr docs
+
+Start at the [project README](../README.md) for install + quick start. These docs go deeper.
+
+| Doc | What it covers |
+|-----|----------------|
+| [cli.md](cli.md) | **Run Programmarr from the terminal** — no Docker. Interactive menu, raw scripts (cron-friendly), and editing `config.json` by hand. |
+| [api.md](api.md) | Backend HTTP endpoint reference (Pipeline / Recipe / Tunarr / TMDB / Plex). |
+| [live-channels-design.md](live-channels-design.md) | How auto-updating "live" channels work — scheduler, in-place updates, rationale. |
+| [tunarr-commercials-findings.md](tunarr-commercials-findings.md) | What does and doesn't work for commercials/filler in Tunarr (QSV mid-roll caveat). |
+| [ideas.md](ideas.md) | Planned/unbuilt ideas — not yet in the product. |