[link-checker] Fix broken gh-aw reference links in cost-tracker docs

docs/cost-tracker.md

@@ -72,8 +72,8 @@ already there if you are running gh-aw with firewall enabled (the default).
 
 ## Learn More
 
-- [token-usage.jsonl reference](https://github.github.com/gh-aw/reference/token-usage/)
-- [gh-aw firewall documentation](https://github.github.com/gh-aw/reference/firewall/)
+- [token-usage.jsonl reference](https://github.github.io/gh-aw/reference/artifacts/#firewall-audit-logs)
+- [gh-aw firewall documentation](https://github.github.io/gh-aw/reference/network/)
 - [CI Doctor workflow](ci-doctor.md) — investigate CI failures automatically
 
 ## Going Further

workflows/cost-tracker.md

@@ -145,7 +145,7 @@ Build a report using this template. Fill in `$TOTAL_COST` and the breakdown tabl
 
 </details>
 
-*Data from [token-usage.jsonl](https://github.github.com/gh-aw/reference/token-usage/) written by gh-aw's firewall.*
+*Data from [token-usage.jsonl](https://github.github.io/gh-aw/reference/artifacts/#firewall-audit-logs) written by gh-aw's firewall.*
 ```
 
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