chore(docs): add vue3 related info

[xanf]

Describe the PR

• Add Vue3 docs

PR checklist

What kind of change does this PR introduce? (check at least one)

• Bugfix (fixes a boo-boo in the code) - fix(...), requires a patch version update
• Feature (adds a new feature to BootstrapVue) - feat(...), requires a minor version update
• Enhancement (augments an existing feature) - feat(...), requires a minor version update
• ARIA accessibility (fixes or improves ARIA accessibility) - fix(...), requires a patch or minor version update
• Documentation update (improves documentation or typo fixes) - chore(docs), requires a patch version update
• Other (please describe)

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Name	Status	Preview	Updated
bootstrap-vue	✅ Ready (Inspect)	Visit Preview	Oct 25, 2022 at 0:16AM (UTC)

[codesandbox-ci]

This pull request is automatically built and testable in CodeSandbox.

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Latest deployment of this branch, based on commit f9956d6:

Sandbox	Source
BootstrapVue Starter Project	Configuration
BootstrapVue Nuxt.js Starter Project	Configuration

[codecov]

Codecov Report

Merging #7068 (f9956d6) into dev (8070787) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##               dev     #7068   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
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  Files          305       305           
  Lines        10452     10452           
  Branches      2550      2550           
=========================================
  Hits         10452     10452           

Flag	Coverage Δ
unittests	100.00% <ø> (ø)

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