feat: remove numeric prefix from component names

[pi0]

Context: #218, https://github.com/nuxt/components/pull/218#issuecomment-896249659

This feature allows adding prefixes to the directory or component names for easier sorting in the filesystem (base/a.vue => 1-base/1.a.vue). Until now such prefix was causing an error, it is a non-breaking change.

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Point by @AMoreaux (https://github.com/nuxt/components/pull/218#issuecomment-896669394):

risk with this is a use case with two folders named: 01.atoms and 02.atoms. The object keys can't have the same name. We could use a revision number for each component, but I can't evaluate the side effect of this change.

This is not an intended use of structure. In such case, we show a warning about name conflict but users should either do:

• Use separate branches for versioning
• Using clear distinct prefix like BaseV1/
• Using nuxtignore patterns like -Base/

Using numbers is also not valid for both Javascript/ESM identifiers and HTML tags

[codecov[bot]]

Codecov Report

Merging #222 (0b0a762) into main (2917fc3) will not change coverage. The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main     #222   +/-   ##
=======================================
  Coverage   86.28%   86.28%           
=======================================
  Files           7        7           
  Lines         175      175           
  Branches       48       48           
=======================================
  Hits          151      151           
  Misses         24       24           

Impacted Files	Coverage Δ
src/scan.ts	98.18% <100.00%> (ø)

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