fix: updated _images links and removed duplicates (#511)

## Description
Updated the links for _images on README.md. Removed duplicated and
unneeded docs files.

Related PR in pepr-docs repo is also ready for review.
...

## Related Issue

Fixes #510
<!-- or -->
Relates to #

## Type of change

- [x] Bug fix (non-breaking change which fixes an issue)
- [ ] New feature (non-breaking change which adds functionality)
- [ ] 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/pepr/blob/main/CONTRIBUTING.md#submitting-a-pull-request)
followed

README.md

@@ -133,7 +133,7 @@ See [actions](./docs/030_user-guide/030_actions.md) for more details.
 
 ## Logical Pepr Flow
 
-![Arch Diagram](./_images/pepr-arch.svg)
+![Arch Diagram](_images/pepr-arch.svg)
 [Source Diagram](_images/pepr-arch.svg)
 
 ## TypeScript

docs/120_contribute/README.md

@@ -6,12 +6,12 @@ Information in this section includes:
 
 ## Contributor Guide
 
-If you are interested in contributing to Pepr, please read our [Contributor Guide](10_contributor-guide.md) to learn more about how to get started.
+If you are interested in contributing to Pepr, please read our [Contributor Guide](010_contributor-guide.md) to learn more about how to get started.
 
 ## Code of Conduct
 
-Please note that this project is released with a [Contributor Code of Conduct](20_code-of-conduct.md). By participating in this project you agree to abide by its terms.
+Please note that this project is released with a [Contributor Code of Conduct](020_code-of-conduct.md). By participating in this project you agree to abide by its terms.
 
 ## Reporting Security Issues
 
-For information on reporting security issues, please see our [Reporting Security Issues](40_report-security-issue.md).
+For information on reporting security issues, please see our [Reporting Security Issues](040_report-security-issue.md).