fix(doc): Use correct LTR/RTL Fela renderer in renderComponent

[miroslavstastny]

fixes #24

RTL component preview in Docs

When component preview in Docs is switched to RTL, two things happen:

1. the component is wrapped by <div dir="rtl">.
2. Fela renderer with RTL plugin is used.

The problem was that getClasses() used hardcoded LTR Fela renderer regardless the switch.
Now renderer is added to fela theme and getClasses() uses the renderer from the theme (via context).

TODO

• Update the CHANGELOG.md

[codecov]

Codecov Report

Merging #34 into master will decrease coverage by 0.02%.
The diff coverage is 66.66%.

@@            Coverage Diff             @@
##           master      #34      +/-   ##
==========================================
- Coverage   82.86%   82.84%   -0.03%     
==========================================
  Files          59       59              
  Lines         846      845       -1     
  Branches      183      182       -1     
==========================================
- Hits          701      700       -1     
  Misses        141      141              
  Partials        4        4

Impacted Files	Coverage Δ
src/components/Provider/Provider.tsx	51.21% <66.66%> (-1.17%)	⬇️

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[kuzhelov]

maybe it would be a good idea to include reference on docs where it is stated that

no further processing with plugins will be done for static styles

http://fela.js.org/docs/advanced/StaticStyle.html

[miroslavstastny]

Thanks, link added.