chore: Add sitemap to documentation website

[hjgraca]

Please provide the issue number

Issue number: #766

Summary

Changes

Added a sitemap configuration to the apidocs/docfx.json file and specifying the site URL in the mkdocs.yml file.

• Docs sitemap: https://docs.powertools.aws.dev/lambda/dotnet/sitemap.xml
• API Docs sitemap: https://docs.powertools.aws.dev/lambda/dotnet/api/sitemap.xml

User experience

Please share what the user experience looks like before and after this change

Checklist

Please leave checklist items unchecked if they do not apply to your change.

• Meets tenets criteria
• I have performed a self-review of this change
• Changes have been tested
• Changes are documented
• PR title follows conventional commit semantics

Is this a breaking change?

RFC issue number:

Checklist:

• Migration process documented
• Implement warnings (if it can live side by side)

Acknowledgment

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud