docs: update example to use the purplin theme

[lirantal]

Fixes #10 to ensure the example reference file example.md is functional.

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[moudev]

thanks, @lirantal. The build process has failed. I found the error is because of the theme's path, in the official themes they put theme: ./

• https://github.com/slidevjs/themes/blob/main/packages/theme-seriph/example.md

I tried to make the changes. I followed the Checking out pull requests locally but it is necessary to create another pull request. Sorry, I don't have much experience in these cases.

can you please make the change? thanks for your help.

[lirantal]

Thank you for looking into that @moudev, I just now updated it with a comment too. Let's see if it deploys correctly

[moudev]

Everything is fine now, @lirantal. Thanks for your help!

[lirantal]

Thank you for pointing me to the right place :-)