aboutPageQuery.jsx

...

export const aboutPageQuery = graphql`
  query AboutPage($id: String!) {
    markdownRemark(id: { eq: $id }) {
      html
      frontmatter {
        title
        mainImage {
          image
          imageAlt
        }
        gallery {
          image
          imageAlt
        }
        developerGroups
        organizers {
          title
          gallery {
            image
            imageAlt
            name
          }
        }
        seo {
          browserTitle
          title
          description
        }
      }
    }
    ...LayoutFragment
  }
`;