feat(video): API guide

content/docs/15.how-to-guides/api.md

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 Extend Kestra by using the API.
 
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 Kestra is built with an API-first design in mind, with a powerful API allowing you to connect Kestra to external systems. Whether that's through your flows directly or using the Kestra API, there's lots of options.
 
 In this guide, we're going to specifically look at the Kestra API and how that can enable you to extend Kestra and integrate it into other systems.