Add no css example to readme

[GeeCastro]

Adresses #100 in the readme

[chrispy-snps]

@AlexVonB, @GeeCastro - now that <script> and <style> are ignored by the base code per #112, I think we should remove this workaround example as it would no longer have any effect. Are you agreeable to this?

[GeeCastro]

Yep 👍

[chrispy-snps]

@GeeCastro - if it weren't for the unfortunately-timed (?) fix, this would have been a great example of the extension mechanism! Thank you for contributing.

[GeeCastro]

I think the doc could be clearer if it said how easy the def concert_<tag>(…) works. Let me open another small pr

[GeeCastro]

#116 something like this feel free to rephrase