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.

book.toml

@@ -1,6 +0,0 @@
-[book]
-authors = ["Charles N Wyble"]
-language = "en"
-multilingual = false
-src = "src"
-title = "Suborbital Systems -  Business/Product/Operations Plan"

pages/01.home/default.md

@@ -1,3 +1,8 @@
+---
+title: 'Suborbital Systems - - Business/Operations/Product Plan - Introduction
'
+menu: 'Suborbital Systems - - Business/Operations/Product Plan - Introduction
'
+---
+
 # Suborbital Systems - - Business/Operations/Product Plan - Introduction
 
 ## Executive Summary for Suborbital Systems

pages/02.chapter_1/default.md

@@ -0,0 +1,6 @@
+---
+title: 'Chapter 1'
+menu: 'Chapter 1'
+---
+
+# Chapter 1

src/SUMMARY.md

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

src/chapter_1.md

@@ -1 +0,0 @@
-# Chapter 1