Separate package and demo with Yarn workspaces

[wimpyprogrammer]

Remove demo-only dependencies like Webpack from the dependency tree of the package published to npm.

[codecov]

Codecov Report

Merging #62 (50fb337) into develop (53c921a) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff            @@
##           develop      #62   +/-   ##
========================================
  Coverage    99.29%   99.29%           
========================================
  Files           22       22           
  Lines          424      424           
  Branches        69       69           
========================================
  Hits           421      421           
  Misses           2        2           
  Partials         1        1           

Impacted Files	Coverage Δ
packages/regex-to-strings/src/Expander.ts	100.00% <ø> (ø)
packages/regex-to-strings/src/Expansion.ts	100.00% <ø> (ø)
packages/regex-to-strings/src/constants/index.ts	100.00% <ø> (ø)
...ex-to-strings/src/expanders/alternative-pattern.ts	100.00% <ø> (ø)
...ges/regex-to-strings/src/expanders/char-pattern.ts	93.33% <ø> (ø)
...o-strings/src/expanders/character-class-pattern.ts	100.00% <ø> (ø)
...ex-to-strings/src/expanders/disjunction-pattern.ts	100.00% <ø> (ø)
...es/regex-to-strings/src/expanders/group-pattern.ts	95.83% <ø> (ø)
...gex-to-strings/src/expanders/repetition-pattern.ts	100.00% <ø> (ø)
...ges/regex-to-strings/src/helpers/iterate-sorted.ts	100.00% <ø> (ø)
... and 12 more

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