feat: components array and simplify usage

[pi0]

• Allow using components: [] inside nuxt.config
• Only enabled default ~/components if components key exists in nuxt.config with a truethy value
• Simplify docs rendered version

[codecov]

Codecov Report

Merging #27 into master will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            master       #27   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            5         5           
  Lines          144       147    +3     
  Branches        29        31    +2     
=========================================
+ Hits           144       147    +3     

Impacted Files	Coverage Δ
src/index.ts	100.00% <100.00%> (ø)

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