Fix CLI breakage caused by snowpack 3.0.0 API updates

[tylerbrostrom]

Snowpack’s public JavaScript API changed somewhat between the 3.0 release candidates and the 3.0 official release. Because microsite’s version range for snowpack is ^3.0.0-rc.2, snowpack currently resolves to 3.0.10—thus breaking the microsite CLI.

Changes to Snowpack’s JavaScript API that affect microsite:

• renaming buildProject to build
• renaming startDevServer to startServer
• changing the return signature of createConfiguration

This PR smooths over those upstream API changes, as well as changes the accepted range for snowpack to ^3.0.0.

Closes #87.

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[natemoo-re]

Thanks so much! I've made the same changes and am hoping to get v1.1.0 (using Snowpack's new 3.0.0 API) out the door in the next day or two.

I don't think I'll be able to add these fixes into Microsite@1.0.x because main is already on next. That's my fault and I'll need to find a better branching strategy moving forward.

[natemoo-re]

Going to close this in favor of #94. I implemented all of these changes, but there were even more that I had to figure out specific to Microsite's internals.

Notably:

• The structure of snowpack.config.js changed
• The default build output changed from __snowpack__ and web_modules to _snowpack and _snowpack/pkg