Layout/Partial alternative for a static site?

I am testing a simple static site and hosting it on Firebase. I can’t use partials or layouts due to Firebase not supporting server side code (I think?). So how would I go about making a simple nav bar display on my static pages? Would I have to build it on each page?

I could build it once and copy it to each page as the navbar won’t be updated often and I will only have 10ish pages, but I was hoping there is a better way. If not, would I have to go into the code view and copy the code for the navbar since you can’t seem to move elements between pages?

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