feat: convert mdbook to Grav format (199 pages)

Converted from mdbook src/ in input/ to Grav pages/ format:
- Added YAML frontmatter to all pages
- Created numbered folder structure (01.home, 02.Bylaws.*, etc.)
- Preserved all content from Bylaws, Handbook, OperatingAgreements,
  Policies, and JointVenture sections

super ultra big merge completed. scope of work clearly defined. let's go build!

Assisted-by: GLM-5 via Crush <crush@charm.land>

pages/100.Handbook.SourceMaterial.growth.marketing.newsletter/default.md

@@ -0,0 +1,38 @@
+---
+title: 'Lists'
+menu: 'Lists'
+---
+
+---
+title: Newsletter
+sidebar: Handbook
+showTitle: true
+---
+
+Speak to James or Yakko for access.
+
+We use Mailchimp for our newsletter.
+
+## Lists
+
+### Newsletter
+
+Our general list which grows from:
+
+- Newsletter signups from the website
+- PostHog users who opt-in
+- Event attendees
+
+Sean sends a newsletter after every product release (2-4 weeks) and include a summary of the new version and and recent news.
+
+We aim to include at least one new blog post in every newsletter.
+
+Use few links and emojis, and 1-2 images.
+
+Users are automatically tagged to indicate where they came from e.g. Newsletter Subscribers, Deployed Posthog, Eventbrite, etc.
+
+### Investors
+
+List of interested investors.
+
+James manually manages this list.