ci: remove theme from go.mod

[hugo-sid]

Temporarily remove hugo-theme-gists theme to fix Netlify deploy

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[bep]

I'm merging this now to see if this clears the build. I tried adding hugo-theme-gist to a local Hugo project, and got the same error on first build, but then it somehow cleared. So I assume it's a cache issue, but it's hard to say what.

• hugo-theme-gist repo could maybe try to create a v1.0.1 tag.
• If that doesn't work, try adding a go.mod file (hugo mod github.com/dmachard/hugo-theme-gists) and then create a new tag.