make theme compatible to gatsby-plugin-mdx v4 #174
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This pull request will solve #172.
I've also updated to React 18.
This is far from perfect. There issues with themes and Gatsby that are difficult to solve.
For now, themes cannot be compatible with the new "Head API". See gatsbyjs/gatsby#35841 (reply in thread) . Result: we need to stick with Helmet until v5 of Gatsby.
I hope that v5 of Gatsby has a better i18n story.