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Complete missing parts of Korean locale. (#2209)

search_placeholder_text, results_found, and back_to_top

Use Font Awesome Kits to use the latest version of icons

Close #2184

Remove unecessary console.log in `lunr-en.js` and `lunr-gr.js` JavaScript

Close #2193

Fix missing fallback title for table of contents

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remove unneeded  type="text/javascript" (#2190)

REF: 
- https://google.github.io/styleguide/htmlcssguide.html#type_Attributes
- https://codeguide.co/#html-style-script
- https://developers.google.com/analytics/devguides/collection/analyticsjs/

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Remove extra `{`

Fixes #2192

Add skip links

Close #2182

Release 4.16.4 💎

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Arithmetic fix in _form.scss (#2169)

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Fix and improve pt-BR localization. (#2162)

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update Font Awesome (#2150)

REF: https://fontawesome.com/changelog/latest

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Fix and complete Spanish localization (#2149)

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