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 +1,22 @@
+---
+title: 'Side Door (Solutions) Group - Business/Operations/Product Plan - Introduction'
+menu: 'Side Door (Solutions) Group - Business/Operations/Product Plan - Introduction'
+---
+
+# Side Door (Solutions) Group - Business/Operations/Product Plan - Introduction
+
+## Executive Summary for Side Door (Solutions) Group
+
+(pending formal review for 501c3/c4/(super)PAC packaging as appropriate, but general idea outlined below )
+
+- (Super)PAC for candidates that support the mission of the TSYS Group
+- 501c4 as a service (SideDoorGroup)
+- TX non profit corporations with intent to become 501c4/(super)PAC
+- Call to action/activism as a service (Side Door Solutions Group)
+
+# Reduction to practice
+
+- [GIT Organization](https://git.knownelement.com/SideDoorGroup) (may be split into SDG/SDSG pending formal review)
+- [Discourse category](https://community.turnsys.com/c/nonprofit/chiefcommonsofficer-sidedoorgroup/14) (may be split into SDG/SDSG pending formal review)
+- [Side Door Group Redmine Project](https://projects.knownelement.com/projects/sidedoorgroup)
+- [Side Door Solutions Group Redmine Project](https://projects.knownelement.com/projects/side-door-solutions-group)