chore(showcase): add BaseTable to showcase (#12821)
chore(showcase): add BaseTable to showcase (#12821)

<!--
  Have any questions? Check out the contributing docs at https://gatsby.dev/contribute, or
  ask in this Pull Request and a Gatsby maintainer will be happy to help :)
-->

## Description

add https://autodesk.github.io/react-base-table/ to showcase



gatsbyjs/gatsby,gatsbyjs/gatsby,gatsbyjs/gatsby,gatsbyjs/gatsby,ChristopherBiscardi/gatsby,gatsbyjs/gatsby,ChristopherBiscardi/gatsby,gatsbyjs/gatsby,ChristopherBiscardi/gatsby,ChristopherBiscardi/gatsby