[Feature Request] docfx modern template support for partial template

[cdervout]

Hello,

I need to customize the modern template to be able to integrate Algolia search into my documentation
Currently to get there, I need to copy the entire template layout file and need to modify contents : #9668

Unfortunately, by doing this, I'm not taking advantage of any changes and corrections made to the template by docfx.

It would be great to be able to define files that will be concatenated with existing content:

• partials/head.tmpl.partial
• partials/body.tmpl.partial:

[DavidMarquezF]

Same issue here

[JordanBird]

I'm getting this too. It would be very useful to be able to have this functionality as modern adds a lot of improvements, namely the PDF generation which is a big piece of functionality to lose for me.

At the very least, if as the link in the opening issue mentions, modern just won't or can't support this type of functionality; it would be nice if that could be reflected in the documentation somewhere.