docs: add docsify site

[dnlup]

Fixes #232

• [x] setup docsify
• [ ] setup publishing branch
• [x] decide deployment strategy (SSR vs GH pages)
• [ ] setup ci

[codecov[bot]]

Codecov Report

Merging #262 (8699e1a) into next (2d78dc9) will not change coverage. The diff coverage is n/a.

@@            Coverage Diff            @@
##              next      #262   +/-   ##
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  Coverage   100.00%   100.00%           
=========================================
  Files           12        12           
  Lines          286       286           
=========================================
  Hits           286       286           

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[dnlup]

After some experimenting, it turns out that SSR is not well supported in docsify atm, leaving GH pages as the remaining option.

At least until https://github.com/docsifyjs/docsify/pull/1227 is merged.