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.

pages/01.home/default.md

@@ -0,0 +1,29 @@
+---
+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
+
+Suborbital Systems is building:
+
+### Hardware
+
+- High Altitude Balloon system (payload agnostic)
+- A payload package (for HFNOC Unit: MorseAware ): Bring Your Own Sensors (BYOS)
+- A payload package (for HFNOC Unit: MorseMachine): Lora Network As A Service (LNAS)
+- A payload package (for HFNOC Unit: MorseConnect): ISP layer2 backhaul mesh
+
+### Software
+
+- StewardOS
+- MorseOS
+- MorseOSSkynet
+
+## Reduction to practice
+
+- [GIT Organization](https://git.knownelement.com/Suborbital-Systems)

pages/02.chapter_1/default.md

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+---
+title: 'Chapter 1'
+menu: 'Chapter 1'
+---
+
+# Chapter 1