Prepare archive output for GitHub Pages (CSS rendering + SEO metadata)

[airajena]

Summary

This PR updates archive output so it is better suited for GitHub Pages publishing and search indexing.

Main goals covered:

• Stop applying visual formatting via Markdown syntax in Java output.
• Use CSS classes and a stylesheet for presentation.
• Emit Pages-friendly, extensionless URLs in sitemap entries.
• Generate crawler metadata files (robots.txt, sitemap.xml) in docs/.

What Changed

1) Rendering moved from Markdown presentation to CSS classes

• Updated daily/index page output to emit class-based HTML blocks for message rows and metadata.
• Removed Markdown bolding/link-style presentation from Java renderers.
• Added stable CSS classes (archive-message, archive-user, archive-text, archive-link, etc.) for theme/styling control.

Files:

• src/main/java/org/apache/fineract/chat/archive/MarkdownRenderer.java
• src/main/java/org/apache/fineract/chat/archive/SlackTextFormatter.java

2) Added generated stylesheet

• Added stylesheet renderer and write step to output:
  • docs/assets/chat-archive.css
• Daily and index pages now include stylesheet references.

Files:

• src/main/java/org/apache/fineract/chat/archive/SiteMetadataRenderer.java
• src/main/java/org/apache/fineract/chat/archive/ChatArchiveApp.java

3) Extensionless URL strategy for Pages

• Added front matter permalinks for generated pages:
  • /
  • /daily/<channel>/
  • /daily/<channel>/<date>/
• Updated sitemap generation to use extensionless URLs instead of .md paths.

Files:

• src/main/java/org/apache/fineract/chat/archive/MarkdownRenderer.java
• src/main/java/org/apache/fineract/chat/archive/SiteMetadataRenderer.java

4) Robots and sitemap generation

• robots.txt is always generated at docs/robots.txt.
• sitemap.xml is generated at docs/sitemap.xml when SITE_BASE_URL is configured.
• Added SITE_BASE_URL configuration support and normalization.

Files:

• src/main/java/org/apache/fineract/chat/archive/ArchiveConfig.java
• src/main/java/org/apache/fineract/chat/archive/ChatArchiveApp.java
• update-archive.yml
• Readme.md

5) Pages workflow template

• Added deploy-pages.yml workflow template for deploying docs/ to GitHub Pages.

File:

• deploy-pages.yml

Verification

Executed locally:

• ./gradlew test

All tests passed.

Added/updated tests:

• src/test/java/org/apache/fineract/chat/archive/MarkdownRendererTest.java
• src/test/java/org/apache/fineract/chat/archive/SiteMetadataRendererTest.java
• src/test/java/org/apache/fineract/chat/archive/SlackTextFormatterTest.java
• src/test/java/org/apache/fineract/chat/archive/ArchiveConfigTest.java

[meonkeys]

LGTM. Thank you!