Cleanup issue templates (#1355)

## Description

This updates our issue templates to include a tech debt kind and use
headers instead of bold.

## Related Issue

Fixes #N/A

## Type of change

- [ ] Bug fix (non-breaking change which fixes an issue)
- [ ] New feature (non-breaking change which adds functionality)
- [X] Other (security config, docs update, etc)

## Checklist before merging

- [X] Test, docs, adr added or updated as needed
- [X] [Contributor Guide
Steps](https://github.com/defenseunicorns/zarf/blob/main/CONTRIBUTING.md#developer-workflow)
followed

.github/ISSUE_TEMPLATE/feature_request.md

@@ -7,14 +7,14 @@ assignees: ''
 
 ---
 
-**Is your feature request related to a problem? Please describe.**
+### Is your feature request related to a problem? Please describe.
 A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]
 
-**Describe the solution you'd like**
+### Describe the solution you'd like
 A clear and concise description of what you want to happen.
 
-**Describe alternatives you've considered**
+### Describe alternatives you've considered
 A clear and concise description of any alternative solutions or features you've considered.
 
-**Additional context**
+### Additional context
 Add any other context or screenshots about the feature request here.

.github/ISSUE_TEMPLATE/tech_debt.md

@@ -0,0 +1,17 @@
+---
+name: Tech debt
+about: Record something that should be investigated or refactored in the future.
+title: ''
+labels: 'tech-debt'
+assignees: ''
+
+---
+
+### Describe what should be investigated or refactored
+A clear and concise description of what should be changed/researched. Ex. This piece of the code is not DRY enough [...]
+
+### Links to any relevant code
+https://github.com/defenseunicorns/zarf/blob/main/README.md?plain=1#L1
+
+### Additional context
+Add any other context or screenshots about the technical debt here.