KB page: update styling of KB page

[Blargian]

Summary

• make all text 14px
  • Title: font-weight: 600
  • description + date: font-weight: 400
• change the order to:
  • title
  • description
  • date
  • badge
• use a muted color for the date
• change date format to : Mon DD, YYYY, e.g.: Jan 27, 2025
• use one of our badges

Additionally:

• improves styling of tags pages

Checklist

• Delete items not relevant to your PR
• URL changes should add a redirect to the old URL via https://github.com/ClickHouse/clickhouse-docs/blob/main/docusaurus.config.js
• If adding a new integration page, also add an entry to the integrations list here: https://github.com/ClickHouse/clickhouse-docs/blob/main/docs/en/integrations/index.mdx