fix(a11y) make sure aria-labelledby/owns are correct

[darrenjennings]

• 191 ARIA attributes must conform to valid values link

• Add docs for <label>
• Ensures every ARIA input field has an accessible name: aria-labelledby attribute does not exist, references elements that do not exist or references elements that are empty link
  • this was due to the fact that aria-labelledby in the ul was always referencing "autosuggest". Now it will use the section config label.

Fixes #191

[codecov-commenter]

Codecov Report

Merging #193 into master will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #193   +/-   ##
=======================================
  Coverage   85.14%   85.14%           
=======================================
  Files           1        1           
  Lines         175      175           
  Branches       51       51           
=======================================
  Hits          149      149           
  Misses         11       11           
  Partials       15       15           

Impacted Files	Coverage Δ
src/Autosuggest.vue	85.14% <ø> (ø)

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