release(ai-gateway): AI Gateway 2.0 - #5385

Changed pages include:

• index.html - view
• 404.html - view
• _explorer/index.html - view
• admin-api/index.html - view
• ai-gateway/index.html - view
• api/index.html - view
• catalog/index.html - view
• changelogs/index.html - view
• contributing/index.html - view
• cookbooks/index.html - view

There are more changes not included in the list