Add "Videos" section to the bottom of each docs page

[leecalcote]

Current Behavior

A new section of the docs site was recently added: https://docs.layer5.io/videos.

Each of the videos will have categories and tags assigned.

Desired Behavior

At the bottom of each documentation page should be a "Related Videos" section in which any video of the same categories and tags assigned to that page should be shown.

Implementation

1. Match on category and tag.

Mockups

1. Create new section of the page.
2. Display collection of related videos in a carousel.

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