feat: support subdomains

[ricardogobbosouza]

• Support subdomains
• Update docs
• Add tests
• Work with spa?
• Refactor, maybe create a class inside plugin and inject 🤔
• Release v2? refactoring this function https://github.com/nuxt-community/router-module/blob/main/templates/plugin.js#L11

[codecov]

Codecov Report

Merging #100 (242af66) into main (18bb2d3) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##              main      #100   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            1         1           
  Lines           21        24    +3     
  Branches         4         7    +3     
=========================================
+ Hits            21        24    +3     

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

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