demo: retarget landing pages to the accounting audience

Reorients the whole sales surface to accounting so it matches the rebuilt
demos. Replaces the Shopify and RevOps persona pages with accounts-payable
(1099) and accounts-receivable pages, refreshes the bookkeeper page, and
rewires the hub + deploy tooling:

- landing/bookkeeper/  — refreshed to the validated bank-rec demo
  (26 -> 20, six phantom duplicates), iframe ?p=bookkeeper.
- landing/ap-1099/     — NEW (replaces shopify-pet/): 1099 vendor prep,
  "24 records -> 8 vendors, 7 missing EINs recovered", iframe ?p=ap-1099,
  amber accent.
- landing/ar-aging/    — NEW (replaces revops/): AR open invoices,
  "26 -> 21, five double-entered invoices removed", iframe ?p=ar-aging,
  green accent.
- landing/index.html   — hub rewritten with the three accounting cards.
- deploy.py / deploy.config.example.json / README.md / _shared/styles.css
  — persona list, sitemap defaults, 404 links, cross-links, docs updated.

All demo iframes now point at the renamed app_demo personas; deploy.py
builds the dist bundle cleanly (verified) and the Gumroad ?from= tags match.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

landing/_shared/styles.css

@@ -5,7 +5,7 @@
  *     with zero build step, no privacy banner needed).
  *   • Mobile-first; layout reflows below 720 px.
  *   • Dark, focused, content-first. Buyer reads this on a laptop
- *     between Shopify exports — keep it readable and skimmable.
+ *     between messy accounting exports — keep it readable and skimmable.
  *   • Persona pages all share this sheet — niche differences live in
  *     copy + accent-color variables overridden in each page's <style>.
  */
@@ -18,7 +18,7 @@
   --text-mute:    #9aa3b2;
   --text-soft:    #c8ced8;
   --rule:         #252a36;
-  --accent:       #6ee7b7;          /* Shopify pet default — overridden per persona */
+  --accent:       #6ee7b7;          /* default accent — overridden per persona */
   --accent-ink:   #052e1a;
   --warn:         #fbbf24;
   --max:          1080px;