add make command to scaffold test data

test_data/archive/old_ideas.md

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+# Old Ideas
+
+Just some random thoughts from the past.

test_data/personal/todo.md

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+# Personal Todos
+
+- [ ] Buy groceries
+- [ ] Call mom
+- [ ] Fix the **sink**

test_data/welcome.md

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+# Welcome to Mend
+
+This is a scaffolded test environment.
+
+## Features
+- **File Tree**: Navigate using arrow keys.
+- **Notes**: View rendered Markdown.
+- **Hints**: Toggle hints with Space.
+
+Try hinting: **Space out**

test_data/work/project_alpha/specs.md

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+# Project Alpha Specs
+
+## Overview
+This is a **top secret** project.
+
+## Requirements
+1. Fast
+2. Reliable
+3. __Secure__