remove legacy docs build scripts

[willingc]

Are these still necessary?

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[alexeyraspopov]

I'm currently using those for testing bugs, like #612. I think these are safe to remove along with targets.docs entry in package.json. I'll try to come up with some better styleguide environment soon (today or tomorrow). While working on #606 and #608 I felt urgent need in having interactive examples that can easily tell me what I'm about to break.

[willingc]

Let's just leave as is for now as you bug squash. Feel free to close too.