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

@@ -1,13 +0,0 @@
-# Americans For A Better Network(AFABN)/ The Free Network Foundation (FNF) - Business/Operations/Product Plan - Introduction
-
-## Executive Summary for AFABN/FNF
-
-- TX non profit corporation with intent to become education 501c3
-- Education 501c3 (AFABN/FNF)
-
-## Reduction to practice
-
-- [GIT Organization](https://git.knownelement.com/org/AFABN/dashboard)
-- [Discourse category](https://community.turnsys.com/c/commons/afabn/5)
-- [AFABN Redmine Project](https://projects.knownelement.com/projects/americans-for-a-better-network)
-- [FNF Redmine Project](https://projects.knownelement.com/projects/the-free-network-foundation)