pre white-space to pre-wrap, rename + add build to browser-sync script

[rdela]

v9.2.12-alpha.9

fix: pre white-space to pre-wrap, rename + fortify browser-sync script

• Unstyled section in third post was breaking layout on mobile.
  Try toggling pre-wrap back to pre to see the issue:
  https://eleventeen.blog/archive/thirdpost/#unstyled
  or see it in Base Blog on small enough screens:
  https://eleventy-base-blog.netlify.app/blog/thirdpost/#unstyled
  Note text is larger in eleventeen.

• pre-wrap Sequences of white space are preserved. Lines are broken at
  newline characters, at <br>, and as necessary to fill line boxes.
  https://developer.mozilla.org/en-US/docs/Web/CSS/white-space

• rename browser-sync script from 9.2.11 / improve activateColorScheme control flow, serve script #23:
  https://github.com/rdela/eleventeen/releases/tag/v9.2.11-alpha.9
  https://github.com/rdela/eleventeen/pull/23/files
  from serve to bs
  this disambiguates it from Eleventy's built in serve / dev server
  also might as well build first so now begins w/ eleventy &&

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