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.

src/SUMMARY.md

@@ -1,3 +0,0 @@
-# Introduction
-
-- [Introduction](./introduction.md)

src/introduction.md

@@ -1,18 +0,0 @@
-# Actual People For Actual People (AP4AP.org) - Business/Operations/Product Plan - Introduction
-
-## Executive Summary for AP4AP
-
-Ap4ap is a ground up take on person to person connection.
-
-- Personal friendship connection
-- Personal romantic connection
-- Co-founder connection
-- Marketplace for products and services
-
-It’s meant to grow organically. See: <https://lobste.rs/about> for the core inspiration of how we want Ap4ap to grow. We are putting our own twist on it with in person connection required and having meetups and offline activities be at the core.  
-
-## Reduction to practice
-
-- [GIT Organization](https://git.knownelement.com/Ap4Ap.org)
-- [Discourse category](https://community.turnsys.com/c/forprofit/ap4ap-org/30)
-- [AP4AP Redmine Project](https://projects.knownelement.com/projects/ap4ap-org)