Update skillmap build to support versioned skillmap

[shakao]

new flow!

• gulp skillmap in pxt to copy all files to the correct locations. this:
  • builds the skillmap
  • copies the index.html into webapp/public as skillmap.html
  • copies the built js and css into built/web/skillmap
• build locally by running pxt skillmap --serve in the target directory
• the previous build command (pxt skillmap in the target) is still around in case we need to deploy before we swap over to the new url

changes:

• all skillmap assets are now permanently kept in docs/static/skillmap
• added npm prebuild and postbuild commands to generate an index.html formatted to our specifications (don't remove comments, don't collapse whitespace), so the backend replacements should all work
• added the skillmap url to the webconfig

for microsoft/pxt-arcade#2584

[pelikhan]

Please add build instructions to the read me.

[pelikhan]

Does the pxt ci run gulp skillmap as part of the build?

[shakao]

yep! although it doesn't have to, i can take it out for now since the backend route changes aren't in either

[pelikhan]

No our ci should build everything so let’s keep it.

…

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[riknoll]

@pelikhan can you mark your changes as resolved?

[riknoll]

thanks!