Fix broken source workflow links for agentic-wiki-coder and agentic-wiki-writer (#231)

The source workflow links in docs/agentic-wiki-coder.md and docs/agentic-wiki-writer.md
pointed to github/gh-aw/.github/workflows/ but those files don't exist there.
The correct location is within this repository at workflows/.

Co-authored-by: GitHub Copilot <copilot@github.com>
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
Co-authored-by: Don Syme <dsyme@users.noreply.github.com>

Author: 4 people

docs/agentic-wiki-coder.md

@@ -61,6 +61,6 @@ After editing the workflow file, run `gh aw compile` to update the compiled work
 
 ## Learn More
 
-- [Agentic Wiki Coder source workflow](https://github.com/github/gh-aw/blob/main/.github/workflows/agentic-wiki-coder.md)
+- [Agentic Wiki Coder source workflow](https://github.com/githubnext/agentics/blob/main/workflows/agentic-wiki-coder.md)
 - [Agentic Wiki Writer](agentic-wiki-writer.md) — the paired reverse workflow
 - [GitHub Wikis documentation](https://docs.github.com/en/communities/documenting-your-project-with-wikis)

docs/agentic-wiki-writer.md

@@ -57,6 +57,6 @@ After editing the workflow file, run `gh aw compile` to update the compiled work
 
 ## Learn More
 
-- [Agentic Wiki Writer source workflow](https://github.com/github/gh-aw/blob/main/.github/workflows/agentic-wiki-writer.md)
+- [Agentic Wiki Writer source workflow](https://github.com/githubnext/agentics/blob/main/workflows/agentic-wiki-writer.md)
 - [Agentic Wiki Coder](agentic-wiki-coder.md) — the paired reverse workflow
 - [GitHub Wikis documentation](https://docs.github.com/en/communities/documenting-your-project-with-wikis)