chore: remove/update pinned gatsby-remark-prismjs plugin

[DSchau]

We fixed this in gatsbyjs/gatsby#9044 🎉

We originally fixed the issue by pinning in #1202

Deploy preview of originally buggy line indenting page

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Deploy preview for reactjs ready!

Built with commit c6f5f4b

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[DSchau]

One note here: I just ran yarn add gatsby-remark-prismjs@latest and it seems to have added a bunch of integrity checks to yarn.lock.

Not quite sure what that's about! I'm thinking it's something in later versions of yarn, perhaps?

[alexkrolick]

Yes, yarn 1.10 added the integrity checks. Let's keep them.

[gaearon]

thanks