chore: remove test_data files from git tracking

test_data/archive/old_ideas.md

@@ -1,3 +0,0 @@
-# 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

@@ -1,9 +0,0 @@
-# Project Alpha Specs
-
-## Overview
-This is a **top secret** project.
-
-## Requirements
-1. Fast
-2. Reliable
-3. __Secure__