feat: convert mdbook to Grav format (199 pages)

Converted from mdbook src/ in input/ to Grav pages/ format:
- Added YAML frontmatter to all pages
- Created numbered folder structure (01.home, 02.Bylaws.*, etc.)
- Preserved all content from Bylaws, Handbook, OperatingAgreements,
  Policies, and JointVenture sections

super ultra big merge completed. scope of work clearly defined. let's go build!

Assisted-by: GLM-5 via Crush <crush@charm.land>

pages/87.Handbook.SourceMaterial.engineering.beginners-guide.technologies-to-learn/default.md

@@ -0,0 +1,38 @@
+---
+title: 'Backend'
+menu: 'Backend'
+---
+
+---
+title: 5. Technologies To Learn
+sidebar: Handbook
+showTitle: true
+hideAnchor: true
+---
+
+Each of the links below will send you to the best resources for learning I found. As I went through learning the 
+various technologies, I took notes. Below you'll find all the notes that I took along with resources I felt were 
+particularly useful. I'd suggest using *our notes* links as you would a cheatsheet.
+
+## Backend
+
+- [Python](https://www.python.org/) ([our notes on Python](notes/python))
+- [Django](https://www.djangoproject.com/) ([our notes on Django](notes/django))
+- [Django Testing](https://docs.djangoproject.com/en/3.1/intro/tutorial05/)
+- [Pytest](https://docs.pytest.org/en/stable/getting-started.html)
+- [Clickhouse](https://clickhouse.tech/) (enterprise database)
+- [Celery](https://docs.celeryproject.org/en/stable/) (we use Redis as Celery's message broker)
+- [Docker](https://www.docker.com/) ([our notes on Docker](notes/docker))
+
+## Frontend
+
+- [React](https://reactjs.org/docs/hello-world.html) ([our notes on React](notes/react))
+- [Redux](https://redux.js.org/introduction/core-concepts)
+- [Kea](https://kea.js.org/docs/introduction/what-is-kea) ([our notes on Kea](notes/kea))
+- [TypeScript](https://www.typescriptlang.org/) ([our notes on TypeScript](notes/typescript))
+
+## Useful tech
+
+- [Tmux](https://github.com/tmux/tmux/wiki)
+- [Fish](https://github.com/fish-shell/fish-shell)
+- [Zsh](https://github.com/ohmyzsh/ohmyzsh)