Austin

Enhance footer style

Add manual and auto contributors and last updated date with git feature.

• Update docusaurus version
• Add tag translation and pages by tags
• Add footer with links
• Add some docs

Add blog section for association newsletter

Add some spaces charters and enhance UI :
- support Icon
- section separator

Add Csharp to postgresQL courses

Update UI for code part in light mode

Add search feature with crawler and new docs on the site

Update UI with the good graphic chart