feat: convert from mdbook to Grav format

- Rename src/ to pages/
- Add Grav frontmatter to markdown files
- Create numbered folder structure
- Remove mdbook-specific files

Migration from mdbook to Grav CMS.

pages/08.offers/default.md

@@ -0,0 +1,31 @@
+---
+title: 'STLP — Initial Offers (Draft)'
+menu: 'STLP — Initial Offers (Draft)'
+---
+
+# STLP — Initial Offers (Draft)
+
+Offer Ladder (start simple; refine after week 1)
+- Entry (fast turnaround, <$100):
+  - Personalized laser-engraved gifts (coasters, keychains, plaques)
+  - Custom vinyl decals (small runs for laptops, cars, storefront hours)
+  - Photo prints/posters (premium paper)
+- Core ($100–$500):
+  - Small signage sets for local businesses (hours, directional, safety)
+  - Embroidered apparel (hats, polos; low-MOQ)
+  - CNC-cut parts for makers (BYO design or light design help)
+- Premium ($500+):
+  - Prototype assemblies (PCB reflow + enclosure mods)
+  - Event packages (signage + favors + shirts)
+
+SKU Starters (price placeholders; confirm in pricing)
+- LAS-COAST-SET4 — Set of 4 engraved coasters — $49
+- VIN-STOREF-HOURS — Storefront hours vinyl — $79
+- EMB-HAT-LOGO — Embroidered hat, 1 logo — $35
+- CNC-PART-S — CNC part (small) — from $45
+- PCB-REFLOW-10 — Reflow 10 boards (stencil provided) — from $149
+
+Policies (keep light)
+- Revisions: one minor revision included on entry/core offers.
+- Turnaround: standard 3–5 business days; rush +20–40%.
+- Materials: BYO accepted; some materials disallowed for laser (e.g., PVC).