Add link to Kedro's YouTube channel

[tynandebold]

Description

Fixes #175

Development notes

Add the YouTube logo and link.

QA notes

Check the deploy preview and make sure all works ok.

Checklist

• [ ] Opened this PR as a 'Draft Pull Request' if it is work-in-progress
• [ ] Added tests to cover my changes, where applicable

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[tynandebold]

It is, but also isn't because the YT logo has a black box around it, so it looks a little off. Will get it in now and we can tweak later.

[stichbury]

Thanks for this swift turnaround @tynandebold -- looks great to me and I checked on mobile also 🌟