Use local build of semiotic on the website

[alexeyraspopov]

This should make it easier to catch bugs early and be able to introduce new functionality/changes along with related documentation without a need to do additional rounds of publishing and updating the website.

I couldn't think of any smarter solution to define a dependency and the fact that the library needs to be built before the website can be served or bundled, so let's start with something straightforward. I'd imagine it can be annoying if you need to restart a website locally often, but the fact the library takes just seconds to build should not be a critical issue.

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[willingc]

Thanks @alexeyraspopov.